221200021999 has 32 divisors (see below), whose sum is σ = 254811375360. Its totient is φ = 189907027200.

The previous prime is 221200021993. The next prime is 221200022033. The reversal of 221200021999 is 999120002122.

It is not a de Polignac number, because 221200021999 - 2⁷ = 221200021871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200021993) 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, 167448259 + ... + 167449579.

It is an arithmetic number, because the mean of its divisors is an integer number (7962855480).

Almost surely, 2^221200021999 is an apocalyptic number.

221200021999 is a deficient number, since it is larger than the sum of its proper divisors (33611353361).

221200021999 is a wasteful number, since it uses less digits than its factorization.

221200021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 221200021999 in words is "two hundred twenty-one billion, two hundred million, twenty-one thousand, nine hundred ninety-nine".