22121111212201 has 4 divisors (see below), whose sum is σ = 22158414941652. Its totient is φ = 22083807482752.

The previous prime is 22121111212177. The next prime is 22121111212241. The reversal of 22121111212201 is 10221211112122.

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 5798218386601 + 16322892825600 = 2407949^2 + 4040160^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121111212201 - 2⁵ = 22121111212169 is a prime.

It is a super-2 number, since 2×22121111212201² (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 (22121111212241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18651863836 + ... + 18651865021.

It is an arithmetic number, because the mean of its divisors is an integer number (5539603735413).

Almost surely, 2^{22121111212201} is an apocalyptic number.

It is an amenable number.

22121111212201 is a deficient number, since it is larger than the sum of its proper divisors (37303729451).

22121111212201 is an equidigital number, since it uses as much as digits as its factorization.

22121111212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37303729450.

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

Adding to 22121111212201 its reverse (10221211112122), we get a palindrome (32342322324323).

The spelling of 22121111212201 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred one".