22110211212121 has 4 divisors (see below), whose sum is σ = 22118277691044. Its totient is φ = 22102144733200.

The previous prime is 22110211212109. The next prime is 22110211212137. The reversal of 22110211212121 is 12121211201122.

It is a happy number.

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 10023150756096 + 12087060456025 = 3165936^2 + 3476645^2 .

It is a cyclic number.

It is not a de Polignac number, because 22110211212121 - 2⁹ = 22110211211609 is a prime.

It is a super-2 number, since 2×22110211212121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22110211212151) 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, 4033235350 + ... + 4033240831.

It is an arithmetic number, because the mean of its divisors is an integer number (5529569422761).

Almost surely, 2^{22110211212121} is an apocalyptic number.

It is an amenable number.

22110211212121 is a deficient number, since it is larger than the sum of its proper divisors (8066478923).

22110211212121 is an equidigital number, since it uses as much as digits as its factorization.

22110211212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8066478922.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 22110211212121 its reverse (12121211201122), we get a palindrome (34231422413243).

The spelling of 22110211212121 in words is "twenty-two trillion, one hundred ten billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".