1321013357 has 2 divisors, whose sum is σ = 1321013358. Its totient is φ = 1321013356.

The previous prime is 1321013263. The next prime is 1321013359. The reversal of 1321013357 is 7533101231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 944886121 + 376127236 = 30739^2 + 19394^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321013357 - 2¹⁸ = 1320751213 is a prime.

Together with 1321013359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321013359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660506678 + 660506679.

It is an arithmetic number, because the mean of its divisors is an integer number (660506679).

Almost surely, 2^1321013357 is an apocalyptic number.

It is an amenable number.

1321013357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321013357 is an equidigital number, since it uses as much as digits as its factorization.

1321013357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 1321013357 is about 36345.7474403815. The cubic root of 1321013357 is about 1097.2419491441.

Adding to 1321013357 its reverse (7533101231), we get a palindrome (8854114588).

The spelling of 1321013357 in words is "one billion, three hundred twenty-one million, thirteen thousand, three hundred fifty-seven".