1221313213323 has 12 divisors (see below), whose sum is σ = 2016136098288. Its totient is φ = 697893264720.

The previous prime is 1221313213319. The next prime is 1221313213327. The reversal of 1221313213323 is 3233123131221.

1221313213323 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 3 + 1 + 321 + 332 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1221313213319) and next prime (1221313213327).

It is not a de Polignac number, because 1221313213323 - 2² = 1221313213319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221313213327) 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, 9692961948 + ... + 9692962073.

It is an arithmetic number, because the mean of its divisors is an integer number (168011341524).

Almost surely, 2^{1221313213323} is an apocalyptic number.

1221313213323 is a deficient number, since it is larger than the sum of its proper divisors (794822884965).

1221313213323 is a wasteful number, since it uses less digits than its factorization.

1221313213323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19385924034 (or 19385924031 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

Adding to 1221313213323 its reverse (3233123131221), we get a palindrome (4454436344544).

The spelling of 1221313213323 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, two hundred thirteen thousand, three hundred twenty-three".