221197065 has 16 divisors (see below), whose sum is σ = 366120000. Its totient is φ = 113903552.

The previous prime is 221197061. The next prime is 221197099. The reversal of 221197065 is 560791122.

221197065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221197065 - 2² = 221197061 is a prime.

It is a super-2 number, since 2×221197065² = 97856283129228450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221197061) 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, 253815 + ... + 254684.

It is an arithmetic number, because the mean of its divisors is an integer number (22882500).

Almost surely, 2^221197065 is an apocalyptic number.

It is an amenable number.

221197065 is a deficient number, since it is larger than the sum of its proper divisors (144922935).

221197065 is a wasteful number, since it uses less digits than its factorization.

221197065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508536.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 221197065 is about 14872.6952836397. The cubic root of 221197065 is about 604.7740111721.

The spelling of 221197065 in words is "two hundred twenty-one million, one hundred ninety-seven thousand, sixty-five".