21031313210 has 32 divisors (see below), whose sum is σ = 38297810880. Its totient is φ = 8314506112.

The previous prime is 21031313189. The next prime is 21031313231. The reversal of 21031313210 is 1231313012.

It is an interprime number because it is at equal distance from previous prime (21031313189) and next prime (21031313231).

It is a super-2 number, since 2×21031313210² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3509837 + ... + 3515823.

It is an arithmetic number, because the mean of its divisors is an integer number (1196806590).

Almost surely, 2^21031313210 is an apocalyptic number.

21031313210 is a deficient number, since it is larger than the sum of its proper divisors (17266497670).

21031313210 is a wasteful number, since it uses less digits than its factorization.

21031313210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10030.

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

Adding to 21031313210 its reverse (1231313012), we get a palindrome (22262626222).

The spelling of 21031313210 in words is "twenty-one billion, thirty-one million, three hundred thirteen thousand, two hundred ten".