21232313031 has 16 divisors (see below), whose sum is σ = 28447421184. Its totient is φ = 14086110144.

The previous prime is 21232313023. The next prime is 21232313051. The reversal of 21232313031 is 13031323212.

It is not a de Polignac number, because 21232313031 - 2³ = 21232313023 is a prime.

It is a super-2 number, since 2×21232313031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21232312989 and 21232313007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232313051) 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, 1381270 + ... + 1396556.

It is an arithmetic number, because the mean of its divisors is an integer number (1777963824).

Almost surely, 2^21232313031 is an apocalyptic number.

21232313031 is a deficient number, since it is larger than the sum of its proper divisors (7215108153).

21232313031 is a wasteful number, since it uses less digits than its factorization.

21232313031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17510.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21232313031 its reverse (13031323212), we get a palindrome (34263636243).

The spelling of 21232313031 in words is "twenty-one billion, two hundred thirty-two million, three hundred thirteen thousand, thirty-one".