202001221999 has 4 divisors (see below), whose sum is σ = 204001234200. Its totient is φ = 200001209800.

The previous prime is 202001221979. The next prime is 202001222009. The reversal of 202001221999 is 999122100202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999122100202 = 2 ⋅499561050101.

It is a cyclic number.

It is not a de Polignac number, because 202001221999 - 2⁵ = 202001221967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202001221969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000005949 + ... + 1000006150.

It is an arithmetic number, because the mean of its divisors is an integer number (51000308550).

Almost surely, 2^202001221999 is an apocalyptic number.

202001221999 is a deficient number, since it is larger than the sum of its proper divisors (2000012201).

202001221999 is a wasteful number, since it uses less digits than its factorization.

202001221999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000012200.

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

The spelling of 202001221999 in words is "two hundred two billion, one million, two hundred twenty-one thousand, nine hundred ninety-nine".