22111110221221 has 16 divisors (see below), whose sum is σ = 25817645850624. Its totient is φ = 18541843161264.

The previous prime is 22111110221129. The next prime is 22111110221251. The reversal of 22111110221221 is 12212201111122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22111110221221 - 2⁹ = 22111110220709 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 (22111110221251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12377475 + ... + 14050768.

It is an arithmetic number, because the mean of its divisors is an integer number (1613602865664).

Almost surely, 2^{22111110221221} is an apocalyptic number.

It is an amenable number.

22111110221221 is a deficient number, since it is larger than the sum of its proper divisors (3706535629403).

22111110221221 is a wasteful number, since it uses less digits than its factorization.

22111110221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26430840.

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

Adding to 22111110221221 its reverse (12212201111122), we get a palindrome (34323311332343).

The spelling of 22111110221221 in words is "twenty-two trillion, one hundred eleven billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".