1222221021 has 16 divisors (see below), whose sum is σ = 1869068928. Its totient is φ = 695923200.

The previous prime is 1222220971. The next prime is 1222221031. The reversal of 1222221021 is 1201222221.

It is not a de Polignac number, because 1222221021 - 2⁷ = 1222220893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222221031) 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, 97660 + ... + 109461.

It is an arithmetic number, because the mean of its divisors is an integer number (116816808).

Almost surely, 2^1222221021 is an apocalyptic number.

It is an amenable number.

1222221021 is a deficient number, since it is larger than the sum of its proper divisors (646847907).

1222221021 is a wasteful number, since it uses less digits than its factorization.

1222221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207412.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1222221021 is about 34960.2777591941. The cubic root of 1222221021 is about 1069.1777597293.

Adding to 1222221021 its reverse (1201222221), we get a palindrome (2423443242).

The spelling of 1222221021 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".