22210222121221 has 4 divisors (see below), whose sum is σ = 22211860902732. Its totient is φ = 22208583339712.

The previous prime is 22210222121201. The next prime is 22210222121249. The reversal of 22210222121221 is 12212122201222.

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 19697965421121 + 2512256700100 = 4438239^2 + 1585010^2 .

It is a cyclic number.

It is not a de Polignac number, because 22210222121221 - 2¹³ = 22210222113029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22210222121192 and 22210222121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22210222121201) 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, 819370426 + ... + 819397531.

It is an arithmetic number, because the mean of its divisors is an integer number (5552965225683).

Almost surely, 2^{22210222121221} is an apocalyptic number.

It is an amenable number.

22210222121221 is a deficient number, since it is larger than the sum of its proper divisors (1638781511).

22210222121221 is a wasteful number, since it uses less digits than its factorization.

22210222121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638781510.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 22210222121221 its reverse (12212122201222), we get a palindrome (34422344322443).

The spelling of 22210222121221 in words is "twenty-two trillion, two hundred ten billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".