21194075730 has 64 divisors (see below), whose sum is σ = 54188144640. Its totient is φ = 5289771456.

The previous prime is 21194075701. The next prime is 21194075767. The reversal of 21194075730 is 3757049112.

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, 176682 + ... + 271301.

It is an arithmetic number, because the mean of its divisors is an integer number (846689760).

Almost surely, 2^21194075730 is an apocalyptic number.

21194075730 is an abundant number, since it is smaller than the sum of its proper divisors (32994068910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21194075730 is a wasteful number, since it uses less digits than its factorization.

21194075730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448095.

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 21194075730 in words is "twenty-one billion, one hundred ninety-four million, seventy-five thousand, seven hundred thirty".