21001002220099 has 24 divisors (see below), whose sum is σ = 24413840440640. Its totient is φ = 18001266822000.

The previous prime is 21001002220091. The next prime is 21001002220111. The reversal of 21001002220099 is 99002220010012.

It is not a de Polignac number, because 21001002220099 - 2³ = 21001002220091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001002220091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21161457 + ... + 22131634.

Almost surely, 2^{21001002220099} is an apocalyptic number.

21001002220099 is a deficient number, since it is larger than the sum of its proper divisors (3412838220541).

21001002220099 is a wasteful number, since it uses less digits than its factorization.

21001002220099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43293343 (or 43293332 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21001002220099 in words is "twenty-one trillion, one billion, two million, two hundred twenty thousand, ninety-nine".