1321210057 has 2 divisors, whose sum is σ = 1321210058. Its totient is φ = 1321210056.

The previous prime is 1321210021. The next prime is 1321210061. The reversal of 1321210057 is 7500121231.

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., 865771776 + 455438281 = 29424^2 + 21341^2 .

It is an emirp because it is prime and its reverse (7500121231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321210057 - 2²⁷ = 1186992329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321210067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660605028 + 660605029.

It is an arithmetic number, because the mean of its divisors is an integer number (660605029).

Almost surely, 2^1321210057 is an apocalyptic number.

It is an amenable number.

1321210057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321210057 is an equidigital number, since it uses as much as digits as its factorization.

1321210057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1321210057 is about 36348.4532958419. The cubic root of 1321210057 is about 1097.2964065243.

Adding to 1321210057 its reverse (7500121231), we get a palindrome (8821331288).

The spelling of 1321210057 in words is "one billion, three hundred twenty-one million, two hundred ten thousand, fifty-seven".