1221132213 has 16 divisors (see below), whose sum is σ = 2067525760. Its totient is φ = 697789728.

The previous prime is 1221132193. The next prime is 1221132251. The reversal of 1221132213 is 3122311221.

It is not a de Polignac number, because 1221132213 - 2⁵ = 1221132181 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 (1221132293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3230320 + ... + 3230697.

It is an arithmetic number, because the mean of its divisors is an integer number (129220360).

Almost surely, 2^1221132213 is an apocalyptic number.

It is an amenable number.

1221132213 is a deficient number, since it is larger than the sum of its proper divisors (846393547).

1221132213 is an equidigital number, since it uses as much as digits as its factorization.

1221132213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461033 (or 6461027 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1221132213 is about 34944.7022165020. The cubic root of 1221132213 is about 1068.8601752839.

Adding to 1221132213 its reverse (3122311221), we get a palindrome (4343443434).

The spelling of 1221132213 in words is "one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred thirteen".