1212100023131 has 4 divisors (see below), whose sum is σ = 1212108295632. Its totient is φ = 1212091750632.

The previous prime is 1212100023091. The next prime is 1212100023209. The reversal of 1212100023131 is 1313200012121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212100023131 is a prime.

It is a super-2 number, since 2×1212100023131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212100023031) 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, 3912431 + ... + 4210856.

It is an arithmetic number, because the mean of its divisors is an integer number (303027073908).

Almost surely, 2^{1212100023131} is an apocalyptic number.

1212100023131 is a deficient number, since it is larger than the sum of its proper divisors (8272501).

1212100023131 is an equidigital number, since it uses as much as digits as its factorization.

1212100023131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272500.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1212100023131 its reverse (1313200012121), we get a palindrome (2525300035252).

The spelling of 1212100023131 in words is "one trillion, two hundred twelve billion, one hundred million, twenty-three thousand, one hundred thirty-one".