52221987 has 24 divisors (see below), whose sum is σ = 78121680. Its totient is φ = 33592320.

The previous prime is 52221973. The next prime is 52221989. The reversal of 52221987 is 78912225.

It is not a de Polignac number, because 52221987 - 2⁸ = 52221731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52221989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35064 + ... + 36522.

It is an arithmetic number, because the mean of its divisors is an integer number (3255070).

Almost surely, 2^52221987 is an apocalyptic number.

52221987 is a deficient number, since it is larger than the sum of its proper divisors (25899693).

52221987 is a wasteful number, since it uses less digits than its factorization.

52221987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1600 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 52221987 is about 7226.4781878865. The cubic root of 52221987 is about 373.7814956139.

The spelling of 52221987 in words is "fifty-two million, two hundred twenty-one thousand, nine hundred eighty-seven".