21555741532 has 96 divisors (see below), whose sum is σ = 44154923904. Its totient is φ = 9118310400.

The previous prime is 21555741521. The next prime is 21555741577. The reversal of 21555741532 is 23514755512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5552232 + ... + 5556112.

It is an arithmetic number, because the mean of its divisors is an integer number (459947124).

Almost surely, 2^21555741532 is an apocalyptic number.

It is an amenable number.

21555741532 is an abundant number, since it is smaller than the sum of its proper divisors (22599182372).

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

21555741532 is a wasteful number, since it uses less digits than its factorization.

21555741532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079 (or 4077 counting only the distinct ones).

The product of its digits is 210000, while the sum is 40.

The spelling of 21555741532 in words is "twenty-one billion, five hundred fifty-five million, seven hundred forty-one thousand, five hundred thirty-two".