21525770234457 has 24 divisors (see below), whose sum is σ = 31317159837600. Its totient is φ = 14246957769408.

The previous prime is 21525770234429. The next prime is 21525770234461. The reversal of 21525770234457 is 75443207752512.

21525770234457 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 577 + 0 + 23 + 4 + 45 + 7 = 666.

It is not a de Polignac number, because 21525770234457 - 2¹² = 21525770230361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21525770234467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65580094 + ... + 65907512.

It is an arithmetic number, because the mean of its divisors is an integer number (1304881659900).

Almost surely, 2^{21525770234457} is an apocalyptic number.

It is an amenable number.

21525770234457 is a deficient number, since it is larger than the sum of its proper divisors (9791389603143).

21525770234457 is a wasteful number, since it uses less digits than its factorization.

21525770234457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380117 (or 380114 counting only the distinct ones).

The product of its (nonzero) digits is 16464000, while the sum is 54.

Adding to 21525770234457 its reverse (75443207752512), we get a palindrome (96968977986969).

The spelling of 21525770234457 in words is "twenty-one trillion, five hundred twenty-five billion, seven hundred seventy million, two hundred thirty-four thousand, four hundred fifty-seven".