221011201 has 2 divisors, whose sum is σ = 221011202. Its totient is φ = 221011200.

The previous prime is 221011177. The next prime is 221011243. The reversal of 221011201 is 102110122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220492801 + 518400 = 14849^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011201 - 2⁷ = 221011073 is a prime.

It is not a weakly prime, because it can be changed into another prime (221012201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505600 + 110505601.

It is an arithmetic number, because the mean of its divisors is an integer number (110505601).

Almost surely, 2^221011201 is an apocalyptic number.

It is an amenable number.

221011201 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011201 is an equidigital number, since it uses as much as digits as its factorization.

221011201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221011201 is about 14866.4454729434. The cubic root of 221011201 is about 604.6045736993.

Adding to 221011201 its reverse (102110122), we get a palindrome (323121323).

The spelling of 221011201 in words is "two hundred twenty-one million, eleven thousand, two hundred one".