15051006721 has 2 divisors, whose sum is σ = 15051006722. Its totient is φ = 15051006720.

The previous prime is 15051006709. The next prime is 15051006739. The reversal of 15051006721 is 12760015051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14835240000 + 215766721 = 121800^2 + 14689^2 .

It is a cyclic number.

It is not a de Polignac number, because 15051006721 - 2⁹ = 15051006209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15051006721.

It is not a weakly prime, because it can be changed into another prime (15051006521) 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, 7525503360 + 7525503361.

It is an arithmetic number, because the mean of its divisors is an integer number (7525503361).

Almost surely, 2^15051006721 is an apocalyptic number.

It is an amenable number.

15051006721 is a deficient number, since it is larger than the sum of its proper divisors (1).

15051006721 is an equidigital number, since it uses as much as digits as its factorization.

15051006721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 28.

The spelling of 15051006721 in words is "fifteen billion, fifty-one million, six thousand, seven hundred twenty-one".