221164977 has 16 divisors (see below), whose sum is σ = 323040960. Its totient is φ = 133478400.

The previous prime is 221164973. The next prime is 221165017. The reversal of 221164977 is 779461122.

It is not a de Polignac number, because 221164977 - 2² = 221164973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221164973) 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, 5952 + ... + 21857.

It is an arithmetic number, because the mean of its divisors is an integer number (20190060).

Almost surely, 2^221164977 is an apocalyptic number.

It is an amenable number.

221164977 is a deficient number, since it is larger than the sum of its proper divisors (101875983).

221164977 is a wasteful number, since it uses less digits than its factorization.

221164977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28064.

The product of its digits is 42336, while the sum is 39.

The square root of 221164977 is about 14871.6164891380. The cubic root of 221164977 is about 604.7447658670.

The spelling of 221164977 in words is "two hundred twenty-one million, one hundred sixty-four thousand, nine hundred seventy-seven".