21012202002209 has 16 divisors (see below), whose sum is σ = 23121309669120. Its totient is φ = 18936961599360.

The previous prime is 21012202002179. The next prime is 21012202002227. The reversal of 21012202002209 is 90220020221012.

It is a cyclic number.

It is not a de Polignac number, because 21012202002209 - 2¹² = 21012201998113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012202002299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17313257 + ... + 18487110.

It is an arithmetic number, because the mean of its divisors is an integer number (1445081854320).

Almost surely, 2^{21012202002209} is an apocalyptic number.

It is an amenable number.

21012202002209 is a deficient number, since it is larger than the sum of its proper divisors (2109107666911).

21012202002209 is a wasteful number, since it uses less digits than its factorization.

21012202002209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35800840.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21012202002209 in words is "twenty-one trillion, twelve billion, two hundred two million, two thousand, two hundred nine".