21201122099 has 4 divisors (see below), whose sum is σ = 21718222680. Its totient is φ = 20684021520.

The previous prime is 21201122077. The next prime is 21201122113. The reversal of 21201122099 is 99022110212.

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 21201122099 - 2¹⁶ = 21201056563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201122069) 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 3 ways as a sum of consecutive naturals, for example, 258550229 + ... + 258550310.

It is an arithmetic number, because the mean of its divisors is an integer number (5429555670).

Almost surely, 2^21201122099 is an apocalyptic number.

21201122099 is a deficient number, since it is larger than the sum of its proper divisors (517100581).

21201122099 is an equidigital number, since it uses as much as digits as its factorization.

21201122099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517100580.

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

The spelling of 21201122099 in words is "twenty-one billion, two hundred one million, one hundred twenty-two thousand, ninety-nine".