21792147387 has 16 divisors (see below), whose sum is σ = 30446392320. Its totient is φ = 13838287232.

The previous prime is 21792147383. The next prime is 21792147389. The reversal of 21792147387 is 78374129712.

It is a cyclic number.

It is not a de Polignac number, because 21792147387 - 2² = 21792147383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21792147383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644238 + ... + 677219.

It is an arithmetic number, because the mean of its divisors is an integer number (1902899520).

Almost surely, 2^21792147387 is an apocalyptic number.

21792147387 is a deficient number, since it is larger than the sum of its proper divisors (8654244933).

21792147387 is a wasteful number, since it uses less digits than its factorization.

21792147387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321722.

The product of its digits is 1185408, while the sum is 51.

The spelling of 21792147387 in words is "twenty-one billion, seven hundred ninety-two million, one hundred forty-seven thousand, three hundred eighty-seven".