21205294750 has 32 divisors (see below), whose sum is σ = 39704970240. Its totient is φ = 8480268000.

The previous prime is 21205294723. The next prime is 21205294829. The reversal of 21205294750 is 5749250212.

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, 2092195 + ... + 2102305.

It is an arithmetic number, because the mean of its divisors is an integer number (1240780320).

Almost surely, 2^21205294750 is an apocalyptic number.

21205294750 is a deficient number, since it is larger than the sum of its proper divisors (18499675490).

21205294750 is a wasteful number, since it uses less digits than its factorization.

21205294750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18517 (or 18507 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 21205294750 in words is "twenty-one billion, two hundred five million, two hundred ninety-four thousand, seven hundred fifty".