221000001999 has 32 divisors (see below), whose sum is σ = 346233839616. Its totient is φ = 122741049600.

The previous prime is 221000001983. The next prime is 221000002021. The reversal of 221000001999 is 999100000122.

It is not a de Polignac number, because 221000001999 - 2⁴ = 221000001983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000001919) 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, 576274 + ... + 879824.

It is an arithmetic number, because the mean of its divisors is an integer number (10819807488).

Almost surely, 2^221000001999 is an apocalyptic number.

221000001999 is a deficient number, since it is larger than the sum of its proper divisors (125233837617).

221000001999 is a wasteful number, since it uses less digits than its factorization.

221000001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304535.

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 221000001999 in words is "two hundred twenty-one billion, one thousand, nine hundred ninety-nine".