21500157413075 has 48 divisors (see below), whose sum is σ = 29705012043264. Its totient is φ = 15302572483200.

The previous prime is 21500157413071. The next prime is 21500157413143. The reversal of 21500157413075 is 57031475100512.

It is not a de Polignac number, because 21500157413075 - 2² = 21500157413071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500157413071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 182274017 + ... + 182391933.

It is an arithmetic number, because the mean of its divisors is an integer number (618854417568).

Almost surely, 2^{21500157413075} is an apocalyptic number.

21500157413075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21500157413075 is a deficient number, since it is larger than the sum of its proper divisors (8204854630189).

21500157413075 is a wasteful number, since it uses less digits than its factorization.

21500157413075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132092 (or 132087 counting only the distinct ones).

The product of its (nonzero) digits is 147000, while the sum is 41.

The spelling of 21500157413075 in words is "twenty-one trillion, five hundred billion, one hundred fifty-seven million, four hundred thirteen thousand, seventy-five".