52157221 has 8 divisors (see below), whose sum is σ = 53959424. Its totient is φ = 50362560.

The previous prime is 52157201. The next prime is 52157267. The reversal of 52157221 is 12275125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52157221 - 2⁷ = 52157093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52157201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14605 + ... + 17821.

It is an arithmetic number, because the mean of its divisors is an integer number (6744928).

Almost surely, 2^52157221 is an apocalyptic number.

It is an amenable number.

52157221 is a deficient number, since it is larger than the sum of its proper divisors (1802203).

52157221 is a wasteful number, since it uses less digits than its factorization.

52157221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3771.

The product of its digits is 1400, while the sum is 25.

The square root of 52157221 is about 7221.9956383260. The cubic root of 52157221 is about 373.6269097239.

The spelling of 52157221 in words is "fifty-two million, one hundred fifty-seven thousand, two hundred twenty-one".