221157057 has 8 divisors (see below), whose sum is σ = 321683040. Its totient is φ = 134034560.

The previous prime is 221157037. The next prime is 221157059. The reversal of 221157057 is 750751122.

221157057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221157057 - 2⁸ = 221156801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221157059) 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, 3350832 + ... + 3350897.

It is an arithmetic number, because the mean of its divisors is an integer number (40210380).

Almost surely, 2^221157057 is an apocalyptic number.

It is an amenable number.

221157057 is a deficient number, since it is larger than the sum of its proper divisors (100525983).

221157057 is a wasteful number, since it uses less digits than its factorization.

221157057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701743.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 221157057 is about 14871.3502076980. The cubic root of 221157057 is about 604.7375470693.

The spelling of 221157057 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, fifty-seven".