21503833744 has 20 divisors (see below), whose sum is σ = 41861142640. Its totient is φ = 10700958240.

The previous prime is 21503833723. The next prime is 21503833759. The reversal of 21503833744 is 44733830512.

It is a junction number, because it is equal to n+sod(n) for n = 21503833697 and 21503833706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3181434 + ... + 3188185.

It is an arithmetic number, because the mean of its divisors is an integer number (2093057132).

Almost surely, 2^21503833744 is an apocalyptic number.

It is an amenable number.

21503833744 is a deficient number, since it is larger than the sum of its proper divisors (20357308896).

21503833744 is a wasteful number, since it uses less digits than its factorization.

21503833744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369838 (or 6369832 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 21503833744 in words is "twenty-one billion, five hundred three million, eight hundred thirty-three thousand, seven hundred forty-four".