21613031612 has 12 divisors (see below), whose sum is σ = 38197289256. Its totient is φ = 10699520400.

The previous prime is 21613031599. The next prime is 21613031681.

21613031612 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21613031612² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26748398 + ... + 26749205.

It is an arithmetic number, because the mean of its divisors is an integer number (3183107438).

Almost surely, 2^21613031612 is an apocalyptic number.

It is an amenable number.

21613031612 is a deficient number, since it is larger than the sum of its proper divisors (16584257644).

21613031612 is a wasteful number, since it uses less digits than its factorization.

21613031612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53497708 (or 53497706 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

It can be divided in two parts, 216130 and 31612, that added together give a palindrome (247742).

The spelling of 21613031612 in words is "twenty-one billion, six hundred thirteen million, thirty-one thousand, six hundred twelve".