21380036147745 has 16 divisors (see below), whose sum is σ = 37317881276352. Its totient is φ = 10366078132160.

The previous prime is 21380036147663. The next prime is 21380036147779. The reversal of 21380036147745 is 54774163008312.

It is a de Polignac number, because none of the positive numbers 2^k-21380036147745 is a prime.

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, 64787988162 + ... + 64787988491.

It is an arithmetic number, because the mean of its divisors is an integer number (2332367579772).

Almost surely, 2^{21380036147745} is an apocalyptic number.

It is an amenable number.

21380036147745 is a deficient number, since it is larger than the sum of its proper divisors (15937845128607).

21380036147745 is a wasteful number, since it uses less digits than its factorization.

21380036147745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129575976672.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 21380036147745 in words is "twenty-one trillion, three hundred eighty billion, thirty-six million, one hundred forty-seven thousand, seven hundred forty-five".