11221999958857 has 2 divisors, whose sum is σ = 11221999958858. Its totient is φ = 11221999958856.

The previous prime is 11221999958843. The next prime is 11221999958861. The reversal of 11221999958857 is 75885999912211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11221401226896 + 598731961 = 3349836^2 + 24469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221999958857 is a prime.

It is not a weakly prime, because it can be changed into another prime (11221919958857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610999979428 + 5610999979429.

It is an arithmetic number, because the mean of its divisors is an integer number (5610999979429).

Almost surely, 2^{11221999958857} is an apocalyptic number.

It is an amenable number.

11221999958857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221999958857 is an equidigital number, since it uses as much as digits as its factorization.

11221999958857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 293932800, while the sum is 76.

The spelling of 11221999958857 in words is "eleven trillion, two hundred twenty-one billion, nine hundred ninety-nine million, nine hundred fifty-eight thousand, eight hundred fifty-seven".