131012222212121 has 4 divisors (see below), whose sum is σ = 131017220987700. Its totient is φ = 131007223436544.

The previous prime is 131012222212049. The next prime is 131012222212139. The reversal of 131012222212121 is 121212222210131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15122454337600 + 115889767874521 = 3888760^2 + 10765211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131012222212121 is a prime.

It is a super-2 number, since 2×131012222212121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131012222212021) 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, 2499348476 + ... + 2499400893.

It is an arithmetic number, because the mean of its divisors is an integer number (32754305246925).

Almost surely, 2^{131012222212121} is an apocalyptic number.

It is an amenable number.

131012222212121 is a deficient number, since it is larger than the sum of its proper divisors (4998775579).

131012222212121 is an equidigital number, since it uses as much as digits as its factorization.

131012222212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998775578.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 131012222212121 its reverse (121212222210131), we get a palindrome (252224444422252).

The spelling of 131012222212121 in words is "one hundred thirty-one trillion, twelve billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".