21554534252 has 12 divisors (see below), whose sum is σ = 37863860496. Its totient is φ = 10736288400.

The previous prime is 21554534237. The next prime is 21554534257. The reversal of 21554534252 is 25243545512.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21554534257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10243499 + ... + 10245602.

It is an arithmetic number, because the mean of its divisors is an integer number (3155321708).

Almost surely, 2^21554534252 is an apocalyptic number.

It is an amenable number.

21554534252 is a deficient number, since it is larger than the sum of its proper divisors (16309326244).

21554534252 is a wasteful number, since it uses less digits than its factorization.

21554534252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20489368 (or 20489366 counting only the distinct ones).

The product of its digits is 240000, while the sum is 38.

The spelling of 21554534252 in words is "twenty-one billion, five hundred fifty-four million, five hundred thirty-four thousand, two hundred fifty-two".