1213121230157 has 2 divisors, whose sum is σ = 1213121230158. Its totient is φ = 1213121230156.

The previous prime is 1213121230129. The next prime is 1213121230177. The reversal of 1213121230157 is 7510321213121.

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., 1168764236836 + 44356993321 = 1081094^2 + 210611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213121230157 - 2³⁴ = 1195941360973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213121230177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606560615078 + 606560615079.

It is an arithmetic number, because the mean of its divisors is an integer number (606560615079).

Almost surely, 2^{1213121230157} is an apocalyptic number.

It is an amenable number.

1213121230157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213121230157 is an equidigital number, since it uses as much as digits as its factorization.

1213121230157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 1213121230157 its reverse (7510321213121), we get a palindrome (8723442443278).

The spelling of 1213121230157 in words is "one trillion, two hundred thirteen billion, one hundred twenty-one million, two hundred thirty thousand, one hundred fifty-seven".