11221520171 has 2 divisors, whose sum is σ = 11221520172. Its totient is φ = 11221520170.

The previous prime is 11221520143. The next prime is 11221520201. The reversal of 11221520171 is 17102512211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11221520171 - 2¹⁰ = 11221519147 is a prime.

It is not a weakly prime, because it can be changed into another prime (11221520111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610760085 + 5610760086.

It is an arithmetic number, because the mean of its divisors is an integer number (5610760086).

Almost surely, 2^11221520171 is an apocalyptic number.

11221520171 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221520171 is an equidigital number, since it uses as much as digits as its factorization.

11221520171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

The spelling of 11221520171 in words is "eleven billion, two hundred twenty-one million, five hundred twenty thousand, one hundred seventy-one".