21140430432 has 48 divisors (see below), whose sum is σ = 60538508352. Its totient is φ = 6406190720.

The previous prime is 21140430397. The next prime is 21140430463. The reversal of 21140430432 is 23403404112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 10008618 + ... + 10010729.

It is an arithmetic number, because the mean of its divisors is an integer number (1261218924).

Almost surely, 2^21140430432 is an apocalyptic number.

21140430432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21140430432 is an abundant number, since it is smaller than the sum of its proper divisors (39398077920).

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

21140430432 is a wasteful number, since it uses less digits than its factorization.

21140430432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20019371 (or 20019363 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21140430432 its reverse (23403404112), we get a palindrome (44543834544).

The spelling of 21140430432 in words is "twenty-one billion, one hundred forty million, four hundred thirty thousand, four hundred thirty-two".