21183130920 has 64 divisors (see below), whose sum is σ = 72627880320. Its totient is φ = 4841858304.

The previous prime is 21183130909. The next prime is 21183130931. The reversal of 21183130920 is 2903138112.

It is an interprime number because it is at equal distance from previous prime (21183130909) and next prime (21183130931).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12608167 + ... + 12609846.

It is an arithmetic number, because the mean of its divisors is an integer number (1134810630).

Almost surely, 2^21183130920 is an apocalyptic number.

21183130920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21183130920 is an abundant number, since it is smaller than the sum of its proper divisors (51444749400).

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

21183130920 is a wasteful number, since it uses less digits than its factorization.

21183130920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25218034 (or 25218030 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 21183130920 in words is "twenty-one billion, one hundred eighty-three million, one hundred thirty thousand, nine hundred twenty".