21122202102221 has 8 divisors (see below), whose sum is σ = 23358051640704. Its totient is φ = 18938960788320.

The previous prime is 21122202102187. The next prime is 21122202102227. The reversal of 21122202102221 is 12220120222112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122202102221 is a prime.

It is a super-2 number, since 2×21122202102221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122202102193 and 21122202102202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122202102227) 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, 13152055301 + ... + 13152056906.

It is an arithmetic number, because the mean of its divisors is an integer number (2919756455088).

Almost surely, 2^{21122202102221} is an apocalyptic number.

It is an amenable number.

21122202102221 is a deficient number, since it is larger than the sum of its proper divisors (2235849538483).

21122202102221 is a wasteful number, since it uses less digits than its factorization.

21122202102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26304112291.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21122202102221 its reverse (12220120222112), we get a palindrome (33342322324333).

The spelling of 21122202102221 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred two million, one hundred two thousand, two hundred twenty-one".