1321042057 has 2 divisors, whose sum is σ = 1321042058. Its totient is φ = 1321042056.

The previous prime is 1321042033. The next prime is 1321042201. The reversal of 1321042057 is 7502401231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783776016 + 537266041 = 27996^2 + 23179^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321042057 - 2¹⁹ = 1320517769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321040057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660521028 + 660521029.

It is an arithmetic number, because the mean of its divisors is an integer number (660521029).

Almost surely, 2^1321042057 is an apocalyptic number.

It is an amenable number.

1321042057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321042057 is an equidigital number, since it uses as much as digits as its factorization.

1321042057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1321042057 is about 36346.1422574666. The cubic root of 1321042057 is about 1097.2498952197.

Adding to 1321042057 its reverse (7502401231), we get a palindrome (8823443288).

The spelling of 1321042057 in words is "one billion, three hundred twenty-one million, forty-two thousand, fifty-seven".