10157541721 has 4 divisors (see below), whose sum is σ = 10692149200. Its totient is φ = 9622934244.

The previous prime is 10157541707. The next prime is 10157541739. The reversal of 10157541721 is 12714575101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12714575101 = 239 ⋅53199059.

It is a cyclic number.

It is not a de Polignac number, because 10157541721 - 2⁵ = 10157541689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10157541791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267303711 + ... + 267303748.

It is an arithmetic number, because the mean of its divisors is an integer number (2673037300).

Almost surely, 2^10157541721 is an apocalyptic number.

It is an amenable number.

10157541721 is a deficient number, since it is larger than the sum of its proper divisors (534607479).

10157541721 is an equidigital number, since it uses as much as digits as its factorization.

10157541721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534607478.

The product of its (nonzero) digits is 9800, while the sum is 34.

The spelling of 10157541721 in words is "ten billion, one hundred fifty-seven million, five hundred forty-one thousand, seven hundred twenty-one".