1222022111221 has 4 divisors (see below), whose sum is σ = 1229519179552. Its totient is φ = 1214525042892.

The previous prime is 1222022111111. The next prime is 1222022111231. The reversal of 1222022111221 is 1221112202221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1222022111221 - 2¹⁷ = 1222021980149 is a prime.

It is a super-2 number, since 2×1222022111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222022111231) 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, 3748533921 + ... + 3748534246.

It is an arithmetic number, because the mean of its divisors is an integer number (307379794888).

Almost surely, 2^{1222022111221} is an apocalyptic number.

It is an amenable number.

1222022111221 is a deficient number, since it is larger than the sum of its proper divisors (7497068331).

1222022111221 is an equidigital number, since it uses as much as digits as its factorization.

1222022111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7497068330.

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

Adding to 1222022111221 its reverse (1221112202221), we get a palindrome (2443134313442).

The spelling of 1222022111221 in words is "one trillion, two hundred twenty-two billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".