21144553522 has 64 divisors (see below), whose sum is σ = 36976435200. Its totient is φ = 8994965760.

The previous prime is 21144553489. The next prime is 21144553567. The reversal of 21144553522 is 22535544112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7115497 + ... + 7118467.

It is an arithmetic number, because the mean of its divisors is an integer number (577756800).

Almost surely, 2^21144553522 is an apocalyptic number.

21144553522 is a deficient number, since it is larger than the sum of its proper divisors (15831881678).

21144553522 is a wasteful number, since it uses less digits than its factorization.

21144553522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511.

The product of its digits is 48000, while the sum is 34.

The spelling of 21144553522 in words is "twenty-one billion, one hundred forty-four million, five hundred fifty-three thousand, five hundred twenty-two".