1222001111221 has 32 divisors (see below), whose sum is σ = 1446260428800. Its totient is φ = 1020597900480.

The previous prime is 1222001111171. The next prime is 1222001111249. The reversal of 1222001111221 is 1221111002221.

It is a cyclic number.

It is not a de Polignac number, because 1222001111221 - 2¹⁵ = 1222001078453 is a prime.

It is a super-2 number, since 2×1222001111221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1222001111195 and 1222001111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222001111291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500056 + ... + 1641358.

It is an arithmetic number, because the mean of its divisors is an integer number (45195638400).

Almost surely, 2^{1222001111221} is an apocalyptic number.

1222001111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222001111221 is a deficient number, since it is larger than the sum of its proper divisors (224259317579).

1222001111221 is a wasteful number, since it uses less digits than its factorization.

1222001111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141489.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1222001111221 its reverse (1221111002221), we get a palindrome (2443112113442).

The spelling of 1222001111221 in words is "one trillion, two hundred twenty-two billion, one million, one hundred eleven thousand, two hundred twenty-one".