221102401 has 8 divisors (see below), whose sum is σ = 238715624. Its totient is φ = 203575680.

The previous prime is 221102389. The next prime is 221102407. The reversal of 221102401 is 104201122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 52128400 + 168974001 = 7220^2 + 12999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221102401 - 2²¹ = 219005249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221102407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16260 + ... + 26581.

It is an arithmetic number, because the mean of its divisors is an integer number (29839453).

Almost surely, 2^221102401 is an apocalyptic number.

It is an amenable number.

221102401 is a deficient number, since it is larger than the sum of its proper divisors (17613223).

221102401 is a wasteful number, since it uses less digits than its factorization.

221102401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43251.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221102401 is about 14869.5124667892. The cubic root of 221102401 is about 604.6877253739.

Adding to 221102401 its reverse (104201122), we get a palindrome (325303523).

The spelling of 221102401 in words is "two hundred twenty-one million, one hundred two thousand, four hundred one".