221575157 has 8 divisors (see below), whose sum is σ = 223200000. Its totient is φ = 219955824.

The previous prime is 221575121. The next prime is 221575163. The reversal of 221575157 is 751575122.

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 221575157 - 2⁸ = 221574901 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 (221575177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109844 + ... + 111842.

It is an arithmetic number, because the mean of its divisors is an integer number (27900000).

Almost surely, 2^221575157 is an apocalyptic number.

It is an amenable number.

221575157 is a deficient number, since it is larger than the sum of its proper divisors (1624843).

221575157 is a wasteful number, since it uses less digits than its factorization.

221575157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755.

The product of its digits is 24500, while the sum is 35.

The square root of 221575157 is about 14885.4008007846. The cubic root of 221575157 is about 605.1183949701.

Subtracting from 221575157 its sum of digits (35), we obtain a palindrome (221575122).

The spelling of 221575157 in words is "two hundred twenty-one million, five hundred seventy-five thousand, one hundred fifty-seven".