21131240310 has 160 divisors (see below), whose sum is σ = 57792445920. Its totient is φ = 5539373568.

The previous prime is 21131240297. The next prime is 21131240321. The reversal of 21131240310 is 1304213112.

21131240310 is a `hidden beast` number, since 2 + 1 + 1 + 312 + 40 + 310 = 666.

It is a super-2 number, since 2×21131240310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12094857 + ... + 12096603.

It is an arithmetic number, because the mean of its divisors is an integer number (361202787).

Almost surely, 2^21131240310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21131240310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28896222960).

21131240310 is an abundant number, since it is smaller than the sum of its proper divisors (36661205610).

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

21131240310 is a wasteful number, since it uses less digits than its factorization.

21131240310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 2003 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21131240310 its reverse (1304213112), we get a palindrome (22435453422).

The spelling of 21131240310 in words is "twenty-one billion, one hundred thirty-one million, two hundred forty thousand, three hundred ten".