21512547004 has 48 divisors (see below), whose sum is σ = 42695009280. Its totient is φ = 9402264000.

The previous prime is 21512546983. The next prime is 21512547037. The reversal of 21512547004 is 40074521512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4525629 + ... + 4530379.

It is an arithmetic number, because the mean of its divisors is an integer number (889479360).

Almost surely, 2^21512547004 is an apocalyptic number.

It is an amenable number.

21512547004 is a deficient number, since it is larger than the sum of its proper divisors (21182462276).

21512547004 is a wasteful number, since it uses less digits than its factorization.

21512547004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9370 (or 9368 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

It can be divided in two parts, 21512 and 547004, that added together give a square (568516 = 754²).

The spelling of 21512547004 in words is "twenty-one billion, five hundred twelve million, five hundred forty-seven thousand, four".