21234231040 has 72 divisors (see below), whose sum is σ = 55486530288. Its totient is φ = 7721533440.

The previous prime is 21234230989. The next prime is 21234231079. The reversal of 21234231040 is 4013243212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 739977 + ... + 768136.

It is an arithmetic number, because the mean of its divisors is an integer number (770646254).

Almost surely, 2^21234231040 is an apocalyptic number.

21234231040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234231040 is an abundant number, since it is smaller than the sum of its proper divisors (34252299248).

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

21234231040 is a wasteful number, since it uses less digits than its factorization.

21234231040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508145 (or 1508131 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21234231040 its reverse (4013243212), we get a palindrome (25247474252).

The spelling of 21234231040 in words is "twenty-one billion, two hundred thirty-four million, two hundred thirty-one thousand, forty".