21430751840 has 48 divisors (see below), whose sum is σ = 50642752608. Its totient is φ = 8570167296.

The previous prime is 21430751827. The next prime is 21430751843. The reversal of 21430751840 is 4815703412.

It is a self number, because there is not a number n which added to its sum of digits gives 21430751840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430751843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733349 + ... + 762011.

It is an arithmetic number, because the mean of its divisors is an integer number (1055057346).

Almost surely, 2^21430751840 is an apocalyptic number.

21430751840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21430751840 is an abundant number, since it is smaller than the sum of its proper divisors (29212000768).

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

21430751840 is a wasteful number, since it uses less digits than its factorization.

21430751840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33351 (or 33343 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 21430751840 in words is "twenty-one billion, four hundred thirty million, seven hundred fifty-one thousand, eight hundred forty".