1321012051 has 2 divisors, whose sum is σ = 1321012052. Its totient is φ = 1321012050.

The previous prime is 1321012037. The next prime is 1321012067. The reversal of 1321012051 is 1502101231.

It is an a-pointer prime, because the next prime (1321012067) can be obtained adding 1321012051 to its sum of digits (16).

It is a weak prime.

It is an emirp because it is prime and its reverse (1502101231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321012051 - 2⁵ = 1321012019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321012151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660506025 + 660506026.

It is an arithmetic number, because the mean of its divisors is an integer number (660506026).

Almost surely, 2^1321012051 is an apocalyptic number.

1321012051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321012051 is an equidigital number, since it uses as much as digits as its factorization.

1321012051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1321012051 is about 36345.7294740386. The cubic root of 1321012051 is about 1097.2415875534.

Adding to 1321012051 its reverse (1502101231), we get a palindrome (2823113282).

The spelling of 1321012051 in words is "one billion, three hundred twenty-one million, twelve thousand, fifty-one".