1220222212221 has 4 divisors (see below), whose sum is σ = 1626962949632. Its totient is φ = 813481474812.

The previous prime is 1220222212219. The next prime is 1220222212337. The reversal of 1220222212221 is 1222122220221.

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 not a de Polignac number, because 1220222212221 - 2¹ = 1220222212219 is a prime.

It is a super-2 number, since 2×1220222212221² (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 (1220222212021) 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, 203370368701 + ... + 203370368706.

It is an arithmetic number, because the mean of its divisors is an integer number (406740737408).

Almost surely, 2^{1220222212221} is an apocalyptic number.

It is an amenable number.

1220222212221 is a deficient number, since it is larger than the sum of its proper divisors (406740737411).

1220222212221 is an equidigital number, since it uses as much as digits as its factorization.

1220222212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406740737410.

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

Adding to 1220222212221 its reverse (1222122220221), we get a palindrome (2442344432442).

The spelling of 1220222212221 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".