21611050631 has 16 divisors (see below), whose sum is σ = 22748381184. Its totient is φ = 20490490944.

The previous prime is 21611050627. The next prime is 21611050633. The reversal of 21611050631 is 13605011612.

It is a cyclic number.

It is not a de Polignac number, because 21611050631 - 2² = 21611050627 is a prime.

It is a super-2 number, since 2×21611050631² (a number of 21 digits) contains 22 as substring.

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 21611050631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611050633) 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, 4224131 + ... + 4229243.

It is an arithmetic number, because the mean of its divisors is an integer number (1421773824).

Almost surely, 2^21611050631 is an apocalyptic number.

21611050631 is a deficient number, since it is larger than the sum of its proper divisors (1137330553).

21611050631 is a wasteful number, since it uses less digits than its factorization.

21611050631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710.

The product of its (nonzero) digits is 1080, while the sum is 26.

The spelling of 21611050631 in words is "twenty-one billion, six hundred eleven million, fifty thousand, six hundred thirty-one".