21022201099 has 4 divisors (see below), whose sum is σ = 21023032320. Its totient is φ = 21021369880.

The previous prime is 21022201033. The next prime is 21022201111. The reversal of 21022201099 is 99010222012.

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

It is a cyclic number.

It is not a de Polignac number, because 21022201099 - 2⁷ = 21022200971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022201699) 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, 376444 + ... + 428665.

It is an arithmetic number, because the mean of its divisors is an integer number (5255758080).

Almost surely, 2^21022201099 is an apocalyptic number.

21022201099 is a deficient number, since it is larger than the sum of its proper divisors (831221).

21022201099 is an equidigital number, since it uses as much as digits as its factorization.

21022201099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831220.

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

The spelling of 21022201099 in words is "twenty-one billion, twenty-two million, two hundred one thousand, ninety-nine".