1022212221 has 4 divisors (see below), whose sum is σ = 1362949632. Its totient is φ = 681474812.

The previous prime is 1022212201. The next prime is 1022212231. The reversal of 1022212221 is 1222122201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1222122201 = 3 ⋅407374067.

It is a cyclic number.

It is not a de Polignac number, because 1022212221 - 2⁶ = 1022212157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1022212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022212201) 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, 170368701 + ... + 170368706.

It is an arithmetic number, because the mean of its divisors is an integer number (340737408).

Almost surely, 2^1022212221 is an apocalyptic number.

It is an amenable number.

1022212221 is a deficient number, since it is larger than the sum of its proper divisors (340737411).

1022212221 is an equidigital number, since it uses as much as digits as its factorization.

1022212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340737410.

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

The square root of 1022212221 is about 31972.0537501112. The cubic root of 1022212221 is about 1007.3499199920.

Adding to 1022212221 its reverse (1222122201), we get a palindrome (2244334422).

The spelling of 1022212221 in words is "one billion, twenty-two million, two hundred twelve thousand, two hundred twenty-one".