21254524536 has 64 divisors (see below), whose sum is σ = 60821383680. Its totient is φ = 6063304320.

The previous prime is 21254524519. The next prime is 21254524559. The reversal of 21254524536 is 63542545212.

It is a junction number, because it is equal to n+sod(n) for n = 21254524494 and 21254524503.

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, 10926 + ... + 206466.

It is an arithmetic number, because the mean of its divisors is an integer number (950334120).

Almost surely, 2^21254524536 is an apocalyptic number.

It is an amenable number.

21254524536 is an abundant number, since it is smaller than the sum of its proper divisors (39566859144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21254524536 is a wasteful number, since it uses less digits than its factorization.

21254524536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196204 (or 196200 counting only the distinct ones).

The product of its digits is 288000, while the sum is 39.

The spelling of 21254524536 in words is "twenty-one billion, two hundred fifty-four million, five hundred twenty-four thousand, five hundred thirty-six".