221865756201 has 12 divisors (see below), whose sum is σ = 320580664560. Its totient is φ = 147860701560.

The previous prime is 221865756181. The next prime is 221865756209. The reversal of 221865756201 is 102657568122.

221865756201 is a `hidden beast` number, since 2 + 2 + 1 + 86 + 5 + 7 + 562 + 0 + 1 = 666.

It is not a de Polignac number, because 221865756201 - 2⁵ = 221865756169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221865756209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4121991 + ... + 4175468.

It is an arithmetic number, because the mean of its divisors is an integer number (26715055380).

Almost surely, 2^221865756201 is an apocalyptic number.

It is an amenable number.

221865756201 is a deficient number, since it is larger than the sum of its proper divisors (98714908359).

221865756201 is a wasteful number, since it uses less digits than its factorization.

221865756201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8300436 (or 8300433 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 221865756201 in words is "two hundred twenty-one billion, eight hundred sixty-five million, seven hundred fifty-six thousand, two hundred one".