1213221323201 has 4 divisors (see below), whose sum is σ = 1218971187504. Its totient is φ = 1207471458900.

The previous prime is 1213221323177. The next prime is 1213221323203. The reversal of 1213221323201 is 1023231223121.

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-1213221323201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213221323203) 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, 2874931835 + ... + 2874932256.

It is an arithmetic number, because the mean of its divisors is an integer number (304742796876).

Almost surely, 2^{1213221323201} is an apocalyptic number.

It is an amenable number.

1213221323201 is a deficient number, since it is larger than the sum of its proper divisors (5749864303).

1213221323201 is an equidigital number, since it uses as much as digits as its factorization.

1213221323201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749864302.

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

Adding to 1213221323201 its reverse (1023231223121), we get a palindrome (2236452546322).

The spelling of 1213221323201 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred one".