21000222099 has 12 divisors (see below), whose sum is σ = 31073499912. Its totient is φ = 13658680800.

The previous prime is 21000222071. The next prime is 21000222101. The reversal of 21000222099 is 99022200012.

It is not a de Polignac number, because 21000222099 - 2¹⁷ = 21000091027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000220099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28455217 + ... + 28455954.

It is an arithmetic number, because the mean of its divisors is an integer number (2589458326).

Almost surely, 2^21000222099 is an apocalyptic number.

21000222099 is a deficient number, since it is larger than the sum of its proper divisors (10073277813).

21000222099 is a wasteful number, since it uses less digits than its factorization.

21000222099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56911218 (or 56911215 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The spelling of 21000222099 in words is "twenty-one billion, two hundred twenty-two thousand, ninety-nine".