21002212099 has 16 divisors (see below), whose sum is σ = 23299696224. Its totient is φ = 18769766400.

The previous prime is 21002212093. The next prime is 21002212169. The reversal of 21002212099 is 99021220012.

It is not a de Polignac number, because 21002212099 - 2²³ = 20993823491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002212093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1410417 + ... + 1425229.

It is an arithmetic number, because the mean of its divisors is an integer number (1456231014).

Almost surely, 2^21002212099 is an apocalyptic number.

21002212099 is a deficient number, since it is larger than the sum of its proper divisors (2297484125).

21002212099 is a wasteful number, since it uses less digits than its factorization.

21002212099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16998.

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

The spelling of 21002212099 in words is "twenty-one billion, two million, two hundred twelve thousand, ninety-nine".