21552442275 has 192 divisors, whose sum is σ = 45117112320. Its totient is φ = 8837337600.

The previous prime is 21552442271. The next prime is 21552442283. The reversal of 21552442275 is 57224425512.

It is not a de Polignac number, because 21552442275 - 2² = 21552442271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21552442271) 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 191 ways as a sum of consecutive naturals, for example, 38281144 + ... + 38281706.

It is an arithmetic number, because the mean of its divisors is an integer number (234984960).

Almost surely, 2^21552442275 is an apocalyptic number.

21552442275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21552442275 is an abundant number, since it is smaller than the sum of its proper divisors (23564670045).

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

21552442275 is a wasteful number, since it uses less digits than its factorization.

21552442275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 741 counting only the distinct ones).

The product of its digits is 224000, while the sum is 39.

Adding to 21552442275 its reverse (57224425512), we get a palindrome (78776867787).

The spelling of 21552442275 in words is "twenty-one billion, five hundred fifty-two million, four hundred forty-two thousand, two hundred seventy-five".