21263598525 has 96 divisors (see below), whose sum is σ = 38997504000. Its totient is φ = 10158370560.

The previous prime is 21263598511. The next prime is 21263598527. The reversal of 21263598525 is 52589536212.

It is not a de Polignac number, because 21263598525 - 2¹³ = 21263590333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263598527) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4542136 + ... + 4546814.

It is an arithmetic number, because the mean of its divisors is an integer number (406224000).

Almost surely, 2^21263598525 is an apocalyptic number.

21263598525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21263598525 is a deficient number, since it is larger than the sum of its proper divisors (17733905475).

21263598525 is a wasteful number, since it uses less digits than its factorization.

21263598525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843 (or 4838 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 48.

The spelling of 21263598525 in words is "twenty-one billion, two hundred sixty-three million, five hundred ninety-eight thousand, five hundred twenty-five".