21547533748 has 48 divisors (see below), whose sum is σ = 41719841856. Its totient is φ = 9674784000.

The previous prime is 21547533713. The next prime is 21547533767. The reversal of 21547533748 is 84733574512.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

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, 542040 + ... + 580432.

It is an arithmetic number, because the mean of its divisors is an integer number (869163372).

Almost surely, 2^21547533748 is an apocalyptic number.

It is an amenable number.

21547533748 is a deficient number, since it is larger than the sum of its proper divisors (20172308108).

21547533748 is a wasteful number, since it uses less digits than its factorization.

21547533748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38704 (or 38702 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 49.

The spelling of 21547533748 in words is "twenty-one billion, five hundred forty-seven million, five hundred thirty-three thousand, seven hundred forty-eight".