1222552221 has 16 divisors (see below), whose sum is σ = 1819614720. Its totient is φ = 723708720.

The previous prime is 1222552211. The next prime is 1222552241.

1222552221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1222552221 - 2¹⁸ = 1222290077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222552191 and 1222552200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222552211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429361 + ... + 432198.

It is an arithmetic number, because the mean of its divisors is an integer number (113725920).

Almost surely, 2^1222552221 is an apocalyptic number.

1222552221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222552221 is a deficient number, since it is larger than the sum of its proper divisors (597062499).

1222552221 is a wasteful number, since it uses less digits than its factorization.

1222552221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861616.

The product of its digits is 1600, while the sum is 24.

The square root of 1222552221 is about 34965.0142428113. The cubic root of 1222552221 is about 1069.2743270131.

It can be divided in two parts, 12225 and 52221, that added together give a palindrome (64446).

The spelling of 1222552221 in words is "one billion, two hundred twenty-two million, five hundred fifty-two thousand, two hundred twenty-one".