1021222213 has 12 divisors (see below), whose sum is σ = 1125060300. Its totient is φ = 926266880.

The previous prime is 1021222207. The next prime is 1021222229. The reversal of 1021222213 is 3122221201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 742399009 + 278823204 = 27247^2 + 16698^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1021222213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44931 + ... + 63727.

It is an arithmetic number, because the mean of its divisors is an integer number (93755025).

Almost surely, 2^1021222213 is an apocalyptic number.

It is an amenable number.

1021222213 is a deficient number, since it is larger than the sum of its proper divisors (103838087).

1021222213 is a wasteful number, since it uses less digits than its factorization.

1021222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19268 (or 19257 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1021222213 is about 31956.5676035459. The cubic root of 1021222213 is about 1007.0246103066.

Adding to 1021222213 its reverse (3122221201), we get a palindrome (4143443414).

The spelling of 1021222213 in words is "one billion, twenty-one million, two hundred twenty-two thousand, two hundred thirteen".