21553161132 has 24 divisors (see below), whose sum is σ = 50301349056. Its totient is φ = 7182867088.

The previous prime is 21553161127. The next prime is 21553161173. The reversal of 21553161132 is 23116135512.

It is a self number, because there is not a number n which added to its sum of digits gives 21553161132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130158 + ... + 245045.

It is an arithmetic number, because the mean of its divisors is an integer number (2095889544).

Almost surely, 2^21553161132 is an apocalyptic number.

It is an amenable number.

21553161132 is an abundant number, since it is smaller than the sum of its proper divisors (28748187924).

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

21553161132 is a wasteful number, since it uses less digits than its factorization.

21553161132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379997 (or 379995 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

Adding to 21553161132 its reverse (23116135512), we get a palindrome (44669296644).

The spelling of 21553161132 in words is "twenty-one billion, five hundred fifty-three million, one hundred sixty-one thousand, one hundred thirty-two".