221550011 has 2 divisors, whose sum is σ = 221550012. Its totient is φ = 221550010.

The previous prime is 221549971. The next prime is 221550023. The reversal of 221550011 is 110055122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221550011 - 2²² = 217355707 is a prime.

It is not a weakly prime, because it can be changed into another prime (221556011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110775005 + 110775006.

It is an arithmetic number, because the mean of its divisors is an integer number (110775006).

Almost surely, 2^221550011 is an apocalyptic number.

221550011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221550011 is an equidigital number, since it uses as much as digits as its factorization.

221550011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 221550011 is about 14884.5561237143. The cubic root of 221550011 is about 605.0955029892.

The spelling of 221550011 in words is "two hundred twenty-one million, five hundred fifty thousand, eleven".