21631214031 has 16 divisors (see below), whose sum is σ = 34696684800. Its totient is φ = 11710130688.

The previous prime is 21631213991. The next prime is 21631214039. The reversal of 21631214031 is 13041213612.

It is a happy number.

It is not a de Polignac number, because 21631214031 - 2⁹ = 21631213519 is a prime.

It is a super-2 number, since 2×21631214031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21631213992 and 21631214010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631214039) 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, 27106386 + ... + 27107183.

It is an arithmetic number, because the mean of its divisors is an integer number (2168542800).

Almost surely, 2^21631214031 is an apocalyptic number.

21631214031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21631214031 is a deficient number, since it is larger than the sum of its proper divisors (13065470769).

21631214031 is a wasteful number, since it uses less digits than its factorization.

21631214031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54213598.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21631214031 its reverse (13041213612), we get a palindrome (34672427643).

The spelling of 21631214031 in words is "twenty-one billion, six hundred thirty-one million, two hundred fourteen thousand, thirty-one".