22111012202221 has 4 divisors (see below), whose sum is σ = 22111053252412. Its totient is φ = 22110971152032.

The previous prime is 22111012202177. The next prime is 22111012202303. The reversal of 22111012202221 is 12220221011122.

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 10152826322500 + 11958185879721 = 3186350^2 + 3458061^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111012202221 - 2⁹ = 22111012201709 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 (22111012202021) 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, 19706256 + ... + 20798041.

It is an arithmetic number, because the mean of its divisors is an integer number (5527763313103).

Almost surely, 2^{22111012202221} is an apocalyptic number.

It is an amenable number.

22111012202221 is a deficient number, since it is larger than the sum of its proper divisors (41050191).

22111012202221 is an equidigital number, since it uses as much as digits as its factorization.

22111012202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41050190.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22111012202221 its reverse (12220221011122), we get a palindrome (34331233213343).

The spelling of 22111012202221 in words is "twenty-two trillion, one hundred eleven billion, twelve million, two hundred two thousand, two hundred twenty-one".