21221102100209 has 8 divisors (see below), whose sum is σ = 23152874453280. Its totient is φ = 19289759956000.

The previous prime is 21221102100157. The next prime is 21221102100239. The reversal of 21221102100209 is 90200120112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221102100209 - 2²⁸ = 21220833664753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21221102100239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107449067 + ... + 107646384.

It is an arithmetic number, because the mean of its divisors is an integer number (2894109306660).

Almost surely, 2^{21221102100209} is an apocalyptic number.

It is an amenable number.

21221102100209 is a deficient number, since it is larger than the sum of its proper divisors (1931772353071).

21221102100209 is a wasteful number, since it uses less digits than its factorization.

21221102100209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215104431.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21221102100209 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred nine".