1213221323211 has 16 divisors (see below), whose sum is σ = 1682382915840. Its totient is φ = 777053682720.

The previous prime is 1213221323203. The next prime is 1213221323233. The reversal of 1213221323211 is 1123231223121.

It is not a de Polignac number, because 1213221323211 - 2³ = 1213221323203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213221323261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77080791 + ... + 77096528.

It is an arithmetic number, because the mean of its divisors is an integer number (105148932240).

Almost surely, 2^{1213221323211} is an apocalyptic number.

1213221323211 is a deficient number, since it is larger than the sum of its proper divisors (469161592629).

1213221323211 is a wasteful number, since it uses less digits than its factorization.

1213221323211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154177426.

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

Adding to 1213221323211 its reverse (1123231223121), we get a palindrome (2336452546332).

The spelling of 1213221323211 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred eleven".