221052557 has 4 divisors (see below), whose sum is σ = 241148256. Its totient is φ = 200956860.

The previous prime is 221052511. The next prime is 221052569. The reversal of 221052557 is 755250122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221052557 - 2⁶ = 221052493 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 (221052577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10047833 + ... + 10047854.

It is an arithmetic number, because the mean of its divisors is an integer number (60287064).

Almost surely, 2^221052557 is an apocalyptic number.

It is an amenable number.

221052557 is a deficient number, since it is larger than the sum of its proper divisors (20095699).

221052557 is a wasteful number, since it uses less digits than its factorization.

221052557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20095698.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 221052557 is about 14867.8363254375. The cubic root of 221052557 is about 604.6422829002.

The spelling of 221052557 in words is "two hundred twenty-one million, fifty-two thousand, five hundred fifty-seven".