1222222001221 has 8 divisors (see below), whose sum is σ = 1361626633080. Its totient is φ = 1089301305792.

The previous prime is 1222222001213. The next prime is 1222222001243. The reversal of 1222222001221 is 1221002222221.

It can be written as a sum of positive squares in 4 ways, for example, as 305532562500 + 916689438721 = 552750^2 + 957439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1222222001221 - 2³ = 1222222001213 is a prime.

It is a super-2 number, since 2×1222222001221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222222001251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620983710 + ... + 1620984463.

It is an arithmetic number, because the mean of its divisors is an integer number (170203329135).

Almost surely, 2^{1222222001221} is an apocalyptic number.

It is an amenable number.

1222222001221 is a deficient number, since it is larger than the sum of its proper divisors (139404631859).

1222222001221 is a wasteful number, since it uses less digits than its factorization.

1222222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241968215.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1222222001221 its reverse (1221002222221), we get a palindrome (2443224223442).

The spelling of 1222222001221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, one thousand, two hundred twenty-one".