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122121213 = 3131310741
BaseRepresentation
bin1110100011101…
…10101111111101
322111210101210220
413101312233331
5222230334323
620041251553
73012004344
oct721665775
9274711726
10122121213
1162a30525
1234a93bb9
131c3ba596
141230cb5b
15aac40e3
hex7476bfd

122121213 has 8 divisors (see below), whose sum is σ = 164071776. Its totient is φ = 80792400.

The previous prime is 122121203. The next prime is 122121239. The reversal of 122121213 is 312121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 122121213 - 218 = 121859069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122121192 and 122121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154978 + ... + 155763.

It is an arithmetic number, because the mean of its divisors is an integer number (20508972).

Almost surely, 2122121213 is an apocalyptic number.

It is an amenable number.

122121213 is a deficient number, since it is larger than the sum of its proper divisors (41950563).

122121213 is a wasteful number, since it uses less digits than its factorization.

122121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310875.

The product of its digits is 48, while the sum is 15.

The square root of 122121213 is about 11050.8467096418. The cubic root of 122121213 is about 496.1317680718.

Adding to 122121213 its reverse (312121221), we get a palindrome (434242434).

The spelling of 122121213 in words is "one hundred twenty-two million, one hundred twenty-one thousand, two hundred thirteen".

Divisors: 1 3 131 393 310741 932223 40707071 122121213