1210121113 has 2 divisors, whose sum is σ = 1210121114. Its totient is φ = 1210121112.

The previous prime is 1210121063. The next prime is 1210121117. The reversal of 1210121113 is 3111210121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 699496704 + 510624409 = 26448^2 + 22597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210121113 - 2⁹ = 1210120601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210121093 and 1210121102.

It is not a weakly prime, because it can be changed into another prime (1210121117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605060556 + 605060557.

It is an arithmetic number, because the mean of its divisors is an integer number (605060557).

Almost surely, 2^1210121113 is an apocalyptic number.

It is an amenable number.

1210121113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210121113 is an equidigital number, since it uses as much as digits as its factorization.

1210121113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1210121113 is about 34786.7950952657. The cubic root of 1210121113 is about 1065.6377888267.

Adding to 1210121113 its reverse (3111210121), we get a palindrome (4321331234).

The spelling of 1210121113 in words is "one billion, two hundred ten million, one hundred twenty-one thousand, one hundred thirteen".