1221310151 has 2 divisors, whose sum is σ = 1221310152. Its totient is φ = 1221310150.

The previous prime is 1221310127. The next prime is 1221310159. The reversal of 1221310151 is 1510131221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1510131221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221310151 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221310159) 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, 610655075 + 610655076.

It is an arithmetic number, because the mean of its divisors is an integer number (610655076).

Almost surely, 2^1221310151 is an apocalyptic number.

1221310151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221310151 is an equidigital number, since it uses as much as digits as its factorization.

1221310151 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 17.

The square root of 1221310151 is about 34947.2481176988. The cubic root of 1221310151 is about 1068.9120892925.

Adding to 1221310151 its reverse (1510131221), we get a palindrome (2731441372).

The spelling of 1221310151 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, one hundred fifty-one".