1213120311101 has 8 divisors (see below), whose sum is σ = 1217009004120. Its totient is φ = 1209232007488.

The previous prime is 1213120311061. The next prime is 1213120311127. The reversal of 1213120311101 is 1011130213121.

It can be written as a sum of positive squares in 4 ways, for example, as 43943059876 + 1169177251225 = 209626^2 + 1081285^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1213120311101 - 2²⁶ = 1213053202237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213120311101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213120301101) 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, 6960515 + ... + 7132671.

It is an arithmetic number, because the mean of its divisors is an integer number (152126125515).

Almost surely, 2^{1213120311101} is an apocalyptic number.

It is an amenable number.

1213120311101 is a deficient number, since it is larger than the sum of its proper divisors (3888693019).

1213120311101 is a wasteful number, since it uses less digits than its factorization.

1213120311101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194703.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1213120311101 its reverse (1011130213121), we get a palindrome (2224250524222).

The spelling of 1213120311101 in words is "one trillion, two hundred thirteen billion, one hundred twenty million, three hundred eleven thousand, one hundred one".