1222021111221 has 48 divisors (see below), whose sum is σ = 1811162396160. Its totient is φ = 793737584640.

The previous prime is 1222021111217. The next prime is 1222021111271. The reversal of 1222021111221 is 1221111202221.

1222021111221 is a `hidden beast` number, since 1 + 2 + 220 + 211 + 11 + 221 = 666.

It is not a de Polignac number, because 1222021111221 - 2² = 1222021111217 is a prime.

It is a super-2 number, since 2×1222021111221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1222021111194 and 1222021111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222021111271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32619861 + ... + 32657301.

It is an arithmetic number, because the mean of its divisors is an integer number (37732549920).

Almost surely, 2^{1222021111221} is an apocalyptic number.

It is an amenable number.

1222021111221 is a deficient number, since it is larger than the sum of its proper divisors (589141284939).

1222021111221 is a wasteful number, since it uses less digits than its factorization.

1222021111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38106 (or 38103 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1222021111221 its reverse (1221111202221), we get a palindrome (2443132313442).

The spelling of 1222021111221 in words is "one trillion, two hundred twenty-two billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".