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20121222031 = 183971093723
BaseRepresentation
bin10010101111010100…
…010111101110001111
31220221021121222121121
4102233110113232033
5312202013101111
613124335341411
71311423364621
oct225724275617
956837558547
1020121222031
1185959a5a19
123a96681867
131b8883bb51
14d8c43cc11
157cb713871
hex4af517b8f

20121222031 has 4 divisors (see below), whose sum is σ = 20122334152. Its totient is φ = 20120109912.

The previous prime is 20121222001. The next prime is 20121222041. The reversal of 20121222031 is 13022212102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20121222031 - 27 = 20121221903 is a prime.

It is a super-2 number, since 2×201212220312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121221996 and 20121222014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121222001) 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, 528465 + ... + 565258.

It is an arithmetic number, because the mean of its divisors is an integer number (5030583538).

Almost surely, 220121222031 is an apocalyptic number.

20121222031 is a deficient number, since it is larger than the sum of its proper divisors (1112121).

20121222031 is a wasteful number, since it uses less digits than its factorization.

20121222031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112120.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121222031 its reverse (13022212102), we get a palindrome (33143434133).

The spelling of 20121222031 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, thirty-one".

Divisors: 1 18397 1093723 20121222031