221956065 has 32 divisors (see below), whose sum is σ = 395303040. Its totient is φ = 118162368.

The previous prime is 221956061. The next prime is 221956087. The reversal of 221956065 is 560659122.

221956065 is a `hidden beast` number, since 22 + 19 + 560 + 65 = 666.

It is not a de Polignac number, because 221956065 - 2² = 221956061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221956061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97834 + ... + 100076.

It is an arithmetic number, because the mean of its divisors is an integer number (12353220).

Almost surely, 2^221956065 is an apocalyptic number.

It is an amenable number.

221956065 is a deficient number, since it is larger than the sum of its proper divisors (173346975).

221956065 is a wasteful number, since it uses less digits than its factorization.

221956065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 221956065 is about 14898.1899907338. The cubic root of 221956065 is about 605.4649477852.

The spelling of 221956065 in words is "two hundred twenty-one million, nine hundred fifty-six thousand, sixty-five".