1231010212121 has 2 divisors, whose sum is σ = 1231010212122. Its totient is φ = 1231010212120.

The previous prime is 1231010212111. The next prime is 1231010212247. The reversal of 1231010212121 is 1212120101321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756752107225 + 474258104896 = 869915^2 + 688664^2 .

It is an emirp because it is prime and its reverse (1212120101321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231010212121 - 2¹⁸ = 1231009949977 is a prime.

It is a super-2 number, since 2×1231010212121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231010212121.

It is not a weakly prime, because it can be changed into another prime (1231010212111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615505106060 + 615505106061.

It is an arithmetic number, because the mean of its divisors is an integer number (615505106061).

Almost surely, 2^{1231010212121} is an apocalyptic number.

It is an amenable number.

1231010212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231010212121 is an equidigital number, since it uses as much as digits as its factorization.

1231010212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1231010212121 its reverse (1212120101321), we get a palindrome (2443130313442).

The spelling of 1231010212121 in words is "one trillion, two hundred thirty-one billion, ten million, two hundred twelve thousand, one hundred twenty-one".