21801335548 has 6 divisors (see below), whose sum is σ = 38152337216. Its totient is φ = 10900667772.

The previous prime is 21801335527. The next prime is 21801335557. The reversal of 21801335548 is 84553310812.

It is a self number, because there is not a number n which added to its sum of digits gives 21801335548.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2725166940 + ... + 2725166947.

Almost surely, 2^21801335548 is an apocalyptic number.

It is an amenable number.

21801335548 is a deficient number, since it is larger than the sum of its proper divisors (16351001668).

21801335548 is a wasteful number, since it uses less digits than its factorization.

21801335548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450333891 (or 5450333889 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 21801335548 in words is "twenty-one billion, eight hundred one million, three hundred thirty-five thousand, five hundred forty-eight".