1221223131113 has 4 divisors (see below), whose sum is σ = 1236681651840. Its totient is φ = 1205764610388.

The previous prime is 1221223131101. The next prime is 1221223131131. The reversal of 1221223131113 is 3111313221221.

It is a happy number.

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 not a de Polignac number, because 1221223131113 - 2¹⁴ = 1221223114729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221223131173) 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, 7729260245 + ... + 7729260402.

It is an arithmetic number, because the mean of its divisors is an integer number (309170412960).

Almost surely, 2^{1221223131113} is an apocalyptic number.

It is an amenable number.

1221223131113 is a deficient number, since it is larger than the sum of its proper divisors (15458520727).

1221223131113 is an equidigital number, since it uses as much as digits as its factorization.

1221223131113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15458520726.

The product of its digits is 432, while the sum is 23.

Adding to 1221223131113 its reverse (3111313221221), we get a palindrome (4332536352334).

The spelling of 1221223131113 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, one hundred thirteen".