21400231020 has 96 divisors (see below), whose sum is σ = 69641510400. Its totient is φ = 4808569344.

The previous prime is 21400231007. The next prime is 21400231093. The reversal of 21400231020 is 2013200412.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407025 + ... + 456584.

It is an arithmetic number, because the mean of its divisors is an integer number (725432400).

Almost surely, 2^21400231020 is an apocalyptic number.

21400231020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21400231020 is an abundant number, since it is smaller than the sum of its proper divisors (48241279380).

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

21400231020 is a wasteful number, since it uses less digits than its factorization.

21400231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863687 (or 863685 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21400231020 its reverse (2013200412), we get a palindrome (23413431432).

The spelling of 21400231020 in words is "twenty-one billion, four hundred million, two hundred thirty-one thousand, twenty".