21083541920 has 48 divisors (see below), whose sum is σ = 56925566208. Its totient is φ = 7228642560.

The previous prime is 21083541901. The next prime is 21083541931. The reversal of 21083541920 is 2914538012.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 9411176 + ... + 9413415.

It is an arithmetic number, because the mean of its divisors is an integer number (1185949296).

Almost surely, 2^21083541920 is an apocalyptic number.

21083541920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21083541920 is an abundant number, since it is smaller than the sum of its proper divisors (35842024288).

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

21083541920 is a wasteful number, since it uses less digits than its factorization.

21083541920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18824613 (or 18824605 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21083541920 in words is "twenty-one billion, eighty-three million, five hundred forty-one thousand, nine hundred twenty".