21210211099 has 12 divisors (see below), whose sum is σ = 26916112728. Its totient is φ = 16527436800.

The previous prime is 21210211097. The next prime is 21210211103. The reversal of 21210211099 is 99011201212.

It is not a de Polignac number, because 21210211099 - 2¹ = 21210211097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210211097) 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, 19674982 + ... + 19676059.

It is an arithmetic number, because the mean of its divisors is an integer number (2243009394).

Almost surely, 2^21210211099 is an apocalyptic number.

21210211099 is a deficient number, since it is larger than the sum of its proper divisors (5705901629).

21210211099 is a wasteful number, since it uses less digits than its factorization.

21210211099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39351066 (or 39351059 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 21210211099 in words is "twenty-one billion, two hundred ten million, two hundred eleven thousand, ninety-nine".