1212220222221 has 32 divisors (see below), whose sum is σ = 1641236889600. Its totient is φ = 795765680640.

The previous prime is 1212220222189. The next prime is 1212220222223. The reversal of 1212220222221 is 1222220222121.

It is not a de Polignac number, because 1212220222221 - 2⁵ = 1212220222189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220222223) 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, 85607740 + ... + 85621898.

It is an arithmetic number, because the mean of its divisors is an integer number (51288652800).

Almost surely, 2^{1212220222221} is an apocalyptic number.

It is an amenable number.

1212220222221 is a deficient number, since it is larger than the sum of its proper divisors (429016667379).

1212220222221 is a wasteful number, since it uses less digits than its factorization.

1212220222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15729.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1212220222221 its reverse (1222220222121), we get a palindrome (2434440444342).

The spelling of 1212220222221 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".