221157607 has 16 divisors (see below), whose sum is σ = 260900352. Its totient is φ = 185192320.

The previous prime is 221157589. The next prime is 221157617. The reversal of 221157607 is 706751122.

It is a cyclic number.

It is not a de Polignac number, because 221157607 - 2²³ = 212768999 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 (221157617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3793 + ... + 21370.

It is an arithmetic number, because the mean of its divisors is an integer number (16306272).

Almost surely, 2^221157607 is an apocalyptic number.

221157607 is a deficient number, since it is larger than the sum of its proper divisors (39742745).

221157607 is a wasteful number, since it uses less digits than its factorization.

221157607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25238.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 221157607 is about 14871.3686996187. The cubic root of 221157607 is about 604.7380483802.

The spelling of 221157607 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, six hundred seven".