21231031310 has 32 divisors (see below), whose sum is σ = 38770389504. Its totient is φ = 8369284000.

The previous prime is 21231031303. The next prime is 21231031321. The reversal of 21231031310 is 1313013212.

It is a super-2 number, since 2×21231031310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2260925 + ... + 2270295.

It is an arithmetic number, because the mean of its divisors is an integer number (1211574672).

Almost surely, 2^21231031310 is an apocalyptic number.

21231031310 is a deficient number, since it is larger than the sum of its proper divisors (17539358194).

21231031310 is a wasteful number, since it uses less digits than its factorization.

21231031310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12640.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21231031310 its reverse (1313013212), we get a palindrome (22544044522).

The spelling of 21231031310 in words is "twenty-one billion, two hundred thirty-one million, thirty-one thousand, three hundred ten".