21252486535 has 24 divisors (see below), whose sum is σ = 29807409456. Its totient is φ = 14504031360.

The previous prime is 21252486529. The next prime is 21252486551. The reversal of 21252486535 is 53568425212.

It is not a de Polignac number, because 21252486535 - 2¹³ = 21252478343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21252486491 and 21252486500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153862 + ... + 257251.

It is an arithmetic number, because the mean of its divisors is an integer number (1241975394).

Almost surely, 2^21252486535 is an apocalyptic number.

21252486535 is a deficient number, since it is larger than the sum of its proper divisors (8554922921).

21252486535 is a wasteful number, since it uses less digits than its factorization.

21252486535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411343 (or 411336 counting only the distinct ones).

The product of its digits is 576000, while the sum is 43.

The spelling of 21252486535 in words is "twenty-one billion, two hundred fifty-two million, four hundred eighty-six thousand, five hundred thirty-five".