10158422521 has 9 divisors (see below), whose sum is σ = 11001367629. Its totient is φ = 9375795936.

The previous prime is 10158422509. The next prime is 10158422563. The reversal of 10158422521 is 12522485101.

The square root of 10158422521 is 100789.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1045810921 + 9112611600 = 32339^2 + 95460^2 .

It is not a de Polignac number, because 10158422521 - 2⁹ = 10158422009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10158422591) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1306381 + ... + 1314133.

It is an arithmetic number, because the mean of its divisors is an integer number (1222374181).

Almost surely, 2^10158422521 is an apocalyptic number.

10158422521 is the 100789-th square number.

10158422521 is the 50395-th centered octagonal number.

It is an amenable number.

10158422521 is a deficient number, since it is larger than the sum of its proper divisors (842945108).

10158422521 is an frugal number, since it uses more digits than its factorization.

10158422521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15532 (or 7766 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

Multiplying 10158422521 by its product of nonzero digits (6400), we get a square (65013904134400 = 8063120²).

The spelling of 10158422521 in words is "ten billion, one hundred fifty-eight million, four hundred twenty-two thousand, five hundred twenty-one".