21525721551753 has 12 divisors (see below), whose sum is σ = 30488565244080. Its totient is φ = 13506335090752.

The previous prime is 21525721551643. The next prime is 21525721551767. The reversal of 21525721551753 is 35715512752512.

It is not a de Polignac number, because 21525721551753 - 2⁹ = 21525721551241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 21525721551696 and 21525721551705.

It is not an unprimeable number, because it can be changed into a prime (21525721551773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12413910063 + ... + 12413911796.

It is an arithmetic number, because the mean of its divisors is an integer number (2540713770340).

Almost surely, 2^{21525721551753} is an apocalyptic number.

It is an amenable number.

21525721551753 is a deficient number, since it is larger than the sum of its proper divisors (8962843692327).

21525721551753 is a wasteful number, since it uses less digits than its factorization.

21525721551753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24827821896 (or 24827821879 counting only the distinct ones).

The product of its digits is 3675000, while the sum is 51.

The spelling of 21525721551753 in words is "twenty-one trillion, five hundred twenty-five billion, seven hundred twenty-one million, five hundred fifty-one thousand, seven hundred fifty-three".