21323524540 has 12 divisors (see below), whose sum is σ = 44779401576. Its totient is φ = 8529409808.

The previous prime is 21323524513. The next prime is 21323524543. The reversal of 21323524540 is 4542532312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323524543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533088094 + ... + 533088133.

It is an arithmetic number, because the mean of its divisors is an integer number (3731616798).

Almost surely, 2^21323524540 is an apocalyptic number.

21323524540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323524540 is an abundant number, since it is smaller than the sum of its proper divisors (23455877036).

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

21323524540 is a wasteful number, since it uses less digits than its factorization.

21323524540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066176236 (or 1066176234 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 21323524540 in words is "twenty-one billion, three hundred twenty-three million, five hundred twenty-four thousand, five hundred forty".