21503833745 has 32 divisors (see below), whose sum is σ = 26598910464. Its totient is φ = 16683840000.

The previous prime is 21503833723. The next prime is 21503833759. The reversal of 21503833745 is 54733830512.

It is a de Polignac number, because none of the positive numbers 2^k-21503833745 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5564684 + ... + 5568546.

It is an arithmetic number, because the mean of its divisors is an integer number (831215952).

Almost surely, 2^21503833745 is an apocalyptic number.

It is an amenable number.

21503833745 is a deficient number, since it is larger than the sum of its proper divisors (5095076719).

21503833745 is a wasteful number, since it uses less digits than its factorization.

21503833745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 21503833745 in words is "twenty-one billion, five hundred three million, eight hundred thirty-three thousand, seven hundred forty-five".