21031313010 has 128 divisors (see below), whose sum is σ = 52780032000. Its totient is φ = 5356834560.

The previous prime is 21031312997. The next prime is 21031313027. The reversal of 21031313010 is 1031313012.

It is a super-2 number, since 2×21031313010² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57305847 + ... + 57306213.

It is an arithmetic number, because the mean of its divisors is an integer number (412344000).

Almost surely, 2^21031313010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031313010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26390016000).

21031313010 is an abundant number, since it is smaller than the sum of its proper divisors (31748718990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031313010 is a wasteful number, since it uses less digits than its factorization.

21031313010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21031313010 its reverse (1031313012), we get a palindrome (22062626022).

The spelling of 21031313010 in words is "twenty-one billion, thirty-one million, three hundred thirteen thousand, ten".