21365041704139 has 16 divisors (see below), whose sum is σ = 26039492236800. Its totient is φ = 17111666300544.

The previous prime is 21365041704131. The next prime is 21365041704161. The reversal of 21365041704139 is 93140714056312.

It is a cyclic number.

It is not a de Polignac number, because 21365041704139 - 2³ = 21365041704131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21365041704131) 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, 645804199 + ... + 645837280.

It is an arithmetic number, because the mean of its divisors is an integer number (1627468264800).

Almost surely, 2^{21365041704139} is an apocalyptic number.

21365041704139 is a deficient number, since it is larger than the sum of its proper divisors (4674450532661).

21365041704139 is a wasteful number, since it uses less digits than its factorization.

21365041704139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291641642.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 21365041704139 in words is "twenty-one trillion, three hundred sixty-five billion, forty-one million, seven hundred four thousand, one hundred thirty-nine".