21122013031 has 16 divisors (see below), whose sum is σ = 24421657600. Its totient is φ = 17894131200.

The previous prime is 21122013019. The next prime is 21122013061. The reversal of 21122013031 is 13031022112.

It is a cyclic number.

It is not a de Polignac number, because 21122013031 - 2³³ = 12532078439 is a prime.

It is a super-2 number, since 2×21122013031² (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 = 21122012996 and 21122013014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122013061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160135 + ... + 260551.

It is an arithmetic number, because the mean of its divisors is an integer number (1526353600).

Almost surely, 2^21122013031 is an apocalyptic number.

21122013031 is a deficient number, since it is larger than the sum of its proper divisors (3299644569).

21122013031 is a wasteful number, since it uses less digits than its factorization.

21122013031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100774.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21122013031 its reverse (13031022112), we get a palindrome (34153035143).

The spelling of 21122013031 in words is "twenty-one billion, one hundred twenty-two million, thirteen thousand, thirty-one".