22100021022221 has 16 divisors (see below), whose sum is σ = 23654559575808. Its totient is φ = 20596317033600.

The previous prime is 22100021022199. The next prime is 22100021022227. The reversal of 22100021022221 is 12222012000122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22100021022221 is a prime.

It is a super-2 number, since 2×22100021022221² (a number of 27 digits) contains 22 as substring.

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 22100021022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100021022227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14765585 + ... + 16193286.

It is an arithmetic number, because the mean of its divisors is an integer number (1478409973488).

Almost surely, 2^{22100021022221} is an apocalyptic number.

It is an amenable number.

22100021022221 is a deficient number, since it is larger than the sum of its proper divisors (1554538553587).

22100021022221 is a wasteful number, since it uses less digits than its factorization.

22100021022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30959692.

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

Adding to 22100021022221 its reverse (12222012000122), we get a palindrome (34322033022343).

The spelling of 22100021022221 in words is "twenty-two trillion, one hundred billion, twenty-one million, twenty-two thousand, two hundred twenty-one".