1221122320213 has 4 divisors (see below), whose sum is σ = 1235834637408. Its totient is φ = 1206410003020.

The previous prime is 1221122320183. The next prime is 1221122320267. The reversal of 1221122320213 is 3120232211221.

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 1221122320213 - 2¹⁷ = 1221122189141 is a prime.

It is a super-2 number, since 2×1221122320213² (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 (1221122320813) 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, 7356158473 + ... + 7356158638.

It is an arithmetic number, because the mean of its divisors is an integer number (308958659352).

Almost surely, 2^{1221122320213} is an apocalyptic number.

It is an amenable number.

1221122320213 is a deficient number, since it is larger than the sum of its proper divisors (14712317195).

1221122320213 is an equidigital number, since it uses as much as digits as its factorization.

1221122320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14712317194.

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

Adding to 1221122320213 its reverse (3120232211221), we get a palindrome (4341354531434).

The spelling of 1221122320213 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, three hundred twenty thousand, two hundred thirteen".