21140431040 has 28 divisors (see below), whose sum is σ = 50340652176. Its totient is φ = 8456172288.

The previous prime is 21140431027. The next prime is 21140431043. The reversal of 21140431040 is 4013404112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21140431043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33031604 + ... + 33032243.

Almost surely, 2^21140431040 is an apocalyptic number.

21140431040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21140431040 is an abundant number, since it is smaller than the sum of its proper divisors (29200221136).

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

21140431040 is an equidigital number, since it uses as much as digits as its factorization.

21140431040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66063864 (or 66063854 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21140431040 its reverse (4013404112), we get a palindrome (25153835152).

The spelling of 21140431040 in words is "twenty-one billion, one hundred forty million, four hundred thirty-one thousand, forty".