1321231230157 has 2 divisors, whose sum is σ = 1321231230158. Its totient is φ = 1321231230156.

The previous prime is 1321231230107. The next prime is 1321231230167. The reversal of 1321231230157 is 7510321321231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1065888991561 + 255342238596 = 1032419^2 + 505314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321231230157 - 2³¹ = 1319083746509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321231230107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660615615078 + 660615615079.

It is an arithmetic number, because the mean of its divisors is an integer number (660615615079).

Almost surely, 2^{1321231230157} is an apocalyptic number.

It is an amenable number.

1321231230157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321231230157 is an equidigital number, since it uses as much as digits as its factorization.

1321231230157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

Adding to 1321231230157 its reverse (7510321321231), we get a palindrome (8831552551388).

The spelling of 1321231230157 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred thirty thousand, one hundred fifty-seven".