21231021310 has 16 divisors (see below), whose sum is σ = 38218068000. Its totient is φ = 8491913056.

The previous prime is 21231021281. The next prime is 21231021337. The reversal of 21231021310 is 1312013212.

It is a super-2 number, since 2×21231021310² (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 (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153831 + ... + 257149.

It is an arithmetic number, because the mean of its divisors is an integer number (2388629250).

Almost surely, 2^21231021310 is an apocalyptic number.

21231021310 is a deficient number, since it is larger than the sum of its proper divisors (16987046690).

21231021310 is a wasteful number, since it uses less digits than its factorization.

21231021310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123875.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21231021310 its reverse (1312013212), we get a palindrome (22543034522).

The spelling of 21231021310 in words is "twenty-one billion, two hundred thirty-one million, twenty-one thousand, three hundred ten".