21631606031 has 8 divisors (see below), whose sum is σ = 24778152960. Its totient is φ = 18499138488.

The previous prime is 21631606013. The next prime is 21631606091. The reversal of 21631606031 is 13060613612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21631606031 - 2¹⁴ = 21631589647 is a prime.

It is a super-2 number, since 2×21631606031² (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 = 21631605985 and 21631606003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631606091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3516551 + ... + 3522696.

It is an arithmetic number, because the mean of its divisors is an integer number (3097269120).

Almost surely, 2^21631606031 is an apocalyptic number.

21631606031 is a deficient number, since it is larger than the sum of its proper divisors (3146546929).

21631606031 is an equidigital number, since it uses as much as digits as its factorization.

21631606031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7039693.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 21631606031 in words is "twenty-one billion, six hundred thirty-one million, six hundred six thousand, thirty-one".