1221213022213 has 4 divisors (see below), whose sum is σ = 1221498957888. Its totient is φ = 1220927086540.

The previous prime is 1221213022207. The next prime is 1221213022279. The reversal of 1221213022213 is 3122203121221.

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.

It is a cyclic number.

It is not a de Polignac number, because 1221213022213 - 2⁹ = 1221213021701 is a prime.

It is a super-2 number, since 2×1221213022213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221213022013) 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, 142961431 + ... + 142969972.

It is an arithmetic number, because the mean of its divisors is an integer number (305374739472).

Almost surely, 2^{1221213022213} is an apocalyptic number.

It is an amenable number.

1221213022213 is a deficient number, since it is larger than the sum of its proper divisors (285935675).

1221213022213 is an equidigital number, since it uses as much as digits as its factorization.

1221213022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285935674.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221213022213 its reverse (3122203121221), we get a palindrome (4343416143434).

The spelling of 1221213022213 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, twenty-two thousand, two hundred thirteen".