11906250721 has 2 divisors, whose sum is σ = 11906250722. Its totient is φ = 11906250720.

The previous prime is 11906250709. The next prime is 11906250731. The reversal of 11906250721 is 12705260911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11905210321 + 1040400 = 109111^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 11906250721 - 2⁵ = 11906250689 is a prime.

It is not a weakly prime, because it can be changed into another prime (11906250731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5953125360 + 5953125361.

It is an arithmetic number, because the mean of its divisors is an integer number (5953125361).

Almost surely, 2^11906250721 is an apocalyptic number.

It is an amenable number.

11906250721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11906250721 is an equidigital number, since it uses as much as digits as its factorization.

11906250721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 11906250721 in words is "eleven billion, nine hundred six million, two hundred fifty thousand, seven hundred twenty-one".