21525741165 has 16 divisors (see below), whose sum is σ = 34521106176. Its totient is φ = 11453755200.

The previous prime is 21525741131. The next prime is 21525741179. The reversal of 21525741165 is 56114752512.

It is not a de Polignac number, because 21525741165 - 2¹⁰ = 21525740141 is a prime.

It is a congruent number.

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, 1658326 + ... + 1671255.

It is an arithmetic number, because the mean of its divisors is an integer number (2157569136).

Almost surely, 2^21525741165 is an apocalyptic number.

It is an amenable number.

21525741165 is a deficient number, since it is larger than the sum of its proper divisors (12995365011).

21525741165 is a wasteful number, since it uses less digits than its factorization.

21525741165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330020.

The product of its digits is 84000, while the sum is 39.

The spelling of 21525741165 in words is "twenty-one billion, five hundred twenty-five million, seven hundred forty-one thousand, one hundred sixty-five".