1213221321213 has 8 divisors (see below), whose sum is σ = 1764685558176. Its totient is φ = 735285649200.

The previous prime is 1213221321209. The next prime is 1213221321229. The reversal of 1213221321213 is 3121231223121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213221321213 - 2² = 1213221321209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213221321293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18382141198 + ... + 18382141263.

It is an arithmetic number, because the mean of its divisors is an integer number (220585694772).

Almost surely, 2^{1213221321213} is an apocalyptic number.

It is an amenable number.

1213221321213 is a deficient number, since it is larger than the sum of its proper divisors (551464236963).

1213221321213 is a wasteful number, since it uses less digits than its factorization.

1213221321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36764282475.

The product of its digits is 864, while the sum is 24.

Adding to 1213221321213 its reverse (3121231223121), we get a palindrome (4334452544334).

The spelling of 1213221321213 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred thirteen".