21200022102221 has 8 divisors (see below), whose sum is σ = 22318562170080. Its totient is φ = 20081756977488.

The previous prime is 21200022102167. The next prime is 21200022102263. The reversal of 21200022102221 is 12220122000212.

It is a happy number.

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 21200022102221 - 2⁴² = 16801975591117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200022102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200022101221) 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, 68577491 + ... + 68885936.

It is an arithmetic number, because the mean of its divisors is an integer number (2789820271260).

Almost surely, 2^{21200022102221} is an apocalyptic number.

It is an amenable number.

21200022102221 is a deficient number, since it is larger than the sum of its proper divisors (1118540067859).

21200022102221 is a wasteful number, since it uses less digits than its factorization.

21200022102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137471563.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21200022102221 its reverse (12220122000212), we get a palindrome (33420144102433).

The spelling of 21200022102221 in words is "twenty-one trillion, two hundred billion, twenty-two million, one hundred two thousand, two hundred twenty-one".