1213203023321 has 4 divisors (see below), whose sum is σ = 1213221212112. Its totient is φ = 1213184834532.

The previous prime is 1213203023299. The next prime is 1213203023327. The reversal of 1213203023321 is 1233203023121.

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 a de Polignac number, because none of the positive numbers 2^k-1213203023321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213203023327) 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, 8993975 + ... + 9127868.

It is an arithmetic number, because the mean of its divisors is an integer number (303305303028).

Almost surely, 2^{1213203023321} is an apocalyptic number.

It is an amenable number.

1213203023321 is a deficient number, since it is larger than the sum of its proper divisors (18188791).

1213203023321 is an equidigital number, since it uses as much as digits as its factorization.

1213203023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18188790.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 1213203023321 its reverse (1233203023121), we get a palindrome (2446406046442).

The spelling of 1213203023321 in words is "one trillion, two hundred thirteen billion, two hundred three million, twenty-three thousand, three hundred twenty-one".