22101002222221 has 4 divisors (see below), whose sum is σ = 23801079316252. Its totient is φ = 20400925128192.

The previous prime is 22101002222219. The next prime is 22101002222251. The reversal of 22101002222221 is 12222220010122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7639060293225 + 14461941928996 = 2763885^2 + 3802886^2 .

It is a cyclic number.

It is not a de Polignac number, because 22101002222221 - 2¹ = 22101002222219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101002222251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850038546996 + ... + 850038547021.

It is an arithmetic number, because the mean of its divisors is an integer number (5950269829063).

Almost surely, 2^{22101002222221} is an apocalyptic number.

It is an amenable number.

22101002222221 is a deficient number, since it is larger than the sum of its proper divisors (1700077094031).

22101002222221 is a wasteful number, since it uses less digits than its factorization.

22101002222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700077094030.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22101002222221 its reverse (12222220010122), we get a palindrome (34323222232343).

The spelling of 22101002222221 in words is "twenty-two trillion, one hundred one billion, two million, two hundred twenty-two thousand, two hundred twenty-one".