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31300122221 = 107609290869
BaseRepresentation
bin11101001001101000…
…011111011001101101
32222210100200221202222
4131021220133121231
51003100312402341
622213514125125
72155434435434
oct351150373155
988710627688
1031300122221
1112302115105
1260964207a5
132c4a8438a4
14172cd9c11b
15c32d4044b
hex749a1f66d

31300122221 has 4 divisors (see below), whose sum is σ = 31300520700. Its totient is φ = 31299723744.

The previous prime is 31300122199. The next prime is 31300122223. The reversal of 31300122221 is 12222100313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 30935884996 + 364237225 = 175886^2 + 19085^2 .

It is a cyclic number.

It is not a de Polignac number, because 31300122221 - 26 = 31300122157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31300122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31300122223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37826 + ... + 253043.

It is an arithmetic number, because the mean of its divisors is an integer number (7825130175).

Almost surely, 231300122221 is an apocalyptic number.

It is an amenable number.

31300122221 is a deficient number, since it is larger than the sum of its proper divisors (398479).

31300122221 is a wasteful number, since it uses less digits than its factorization.

31300122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398478.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31300122221 its reverse (12222100313), we get a palindrome (43522222534).

The spelling of 31300122221 in words is "thirty-one billion, three hundred million, one hundred twenty-two thousand, two hundred twenty-one".

Divisors: 1 107609 290869 31300122221