1221302132213 has 4 divisors (see below), whose sum is σ = 1221567810540. Its totient is φ = 1221036453888.

The previous prime is 1221302132189. The next prime is 1221302132231. The reversal of 1221302132213 is 3122312031221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 254417342404 + 966884789809 = 504398^2 + 983303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221302132213 - 2¹² = 1221302128117 is a prime.

It is a super-3 number, since 3×1221302132213³ (a number of 37 digits) contains 333 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 (1221302132273) 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, 132832268 + ... + 132841461.

It is an arithmetic number, because the mean of its divisors is an integer number (305391952635).

Almost surely, 2^{1221302132213} is an apocalyptic number.

It is an amenable number.

1221302132213 is a deficient number, since it is larger than the sum of its proper divisors (265678327).

1221302132213 is an equidigital number, since it uses as much as digits as its factorization.

1221302132213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265678326.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221302132213 its reverse (3122312031221), we get a palindrome (4343614163434).

The spelling of 1221302132213 in words is "one trillion, two hundred twenty-one billion, three hundred two million, one hundred thirty-two thousand, two hundred thirteen".