21125450744 has 16 divisors (see below), whose sum is σ = 40018574400. Its totient is φ = 10453830912.

The previous prime is 21125450737. The next prime is 21125450767. The reversal of 21125450744 is 44705452112.

It is a congruent number.

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, 13610984 + ... + 13612535.

It is an arithmetic number, because the mean of its divisors is an integer number (2501160900).

Almost surely, 2^21125450744 is an apocalyptic number.

It is an amenable number.

21125450744 is a deficient number, since it is larger than the sum of its proper divisors (18893123656).

21125450744 is a wasteful number, since it uses less digits than its factorization.

21125450744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27223622 (or 27223618 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The spelling of 21125450744 in words is "twenty-one billion, one hundred twenty-five million, four hundred fifty thousand, seven hundred forty-four".