221959157 has 8 divisors (see below), whose sum is σ = 268589376. Its totient is φ = 179059392.

The previous prime is 221959151. The next prime is 221959187. The reversal of 221959157 is 751959122.

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 221959157 - 2⁶ = 221959093 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 (221959151) 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, 932483 + ... + 932720.

It is an arithmetic number, because the mean of its divisors is an integer number (33573672).

Almost surely, 2^221959157 is an apocalyptic number.

It is an amenable number.

221959157 is a deficient number, since it is larger than the sum of its proper divisors (46630219).

221959157 is a wasteful number, since it uses less digits than its factorization.

221959157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865227.

The product of its digits is 56700, while the sum is 41.

The square root of 221959157 is about 14898.2937613674. The cubic root of 221959157 is about 605.4677592860.

The spelling of 221959157 in words is "two hundred twenty-one million, nine hundred fifty-nine thousand, one hundred fifty-seven".