21002001220199 has 4 divisors (see below), whose sum is σ = 21679485130560. Its totient is φ = 20324517309840.

The previous prime is 21002001220121. The next prime is 21002001220217. The reversal of 21002001220199 is 99102210020012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21002001220199 - 2²⁰ = 21002000171623 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 (21002001220099) 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, 338741955134 + ... + 338741955195.

It is an arithmetic number, because the mean of its divisors is an integer number (5419871282640).

Almost surely, 2^{21002001220199} is an apocalyptic number.

21002001220199 is a deficient number, since it is larger than the sum of its proper divisors (677483910361).

21002001220199 is an equidigital number, since it uses as much as digits as its factorization.

21002001220199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677483910360.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21002001220199 in words is "twenty-one trillion, two billion, one million, two hundred twenty thousand, one hundred ninety-nine".