21310031240 has 32 divisors (see below), whose sum is σ = 48967735680. Its totient is φ = 8342649792.

The previous prime is 21310031213. The next prime is 21310031269. The reversal of 21310031240 is 4213001312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5665682 + ... + 5669441.

It is an arithmetic number, because the mean of its divisors is an integer number (1530241740).

Almost surely, 2^21310031240 is an apocalyptic number.

21310031240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310031240 is an abundant number, since it is smaller than the sum of its proper divisors (27657704440).

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

21310031240 is a wasteful number, since it uses less digits than its factorization.

21310031240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11335181 (or 11335177 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21310031240 its reverse (4213001312), we get a palindrome (25523032552).

The spelling of 21310031240 in words is "twenty-one billion, three hundred ten million, thirty-one thousand, two hundred forty".