21621200041209 has 64 divisors (see below), whose sum is σ = 29951534592000. Its totient is φ = 13866772727808.

The previous prime is 21621200041183. The next prime is 21621200041279. The reversal of 21621200041209 is 90214000212612.

It is not a de Polignac number, because 21621200041209 - 2²⁰ = 21621198992633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21621200041279) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3926127634 + ... + 3926133140.

It is an arithmetic number, because the mean of its divisors is an integer number (467992728000).

Almost surely, 2^{21621200041209} is an apocalyptic number.

It is an amenable number.

21621200041209 is a deficient number, since it is larger than the sum of its proper divisors (8330334550791).

21621200041209 is a wasteful number, since it uses less digits than its factorization.

21621200041209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8302.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 21621200041209 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred million, forty-one thousand, two hundred nine".