1021232321257 has 2 divisors, whose sum is σ = 1021232321258. Its totient is φ = 1021232321256.

The previous prime is 1021232321191. The next prime is 1021232321287. The reversal of 1021232321257 is 7521232321201.

1021232321257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 731681787456 + 289550533801 = 855384^2 + 538099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021232321257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021232321287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510616160628 + 510616160629.

It is an arithmetic number, because the mean of its divisors is an integer number (510616160629).

Almost surely, 2^{1021232321257} is an apocalyptic number.

It is an amenable number.

1021232321257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021232321257 is an equidigital number, since it uses as much as digits as its factorization.

1021232321257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 1021232321257 its reverse (7521232321201), we get a palindrome (8542464642458).

The spelling of 1021232321257 in words is "one trillion, twenty-one billion, two hundred thirty-two million, three hundred twenty-one thousand, two hundred fifty-seven".