221040401 has 2 divisors, whose sum is σ = 221040402. Its totient is φ = 221040400.

The previous prime is 221040397. The next prime is 221040403. The reversal of 221040401 is 104040122.

221040401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220492801 + 547600 = 14849^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 221040401 - 2² = 221040397 is a prime.

Together with 221040403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221040403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110520200 + 110520201.

It is an arithmetic number, because the mean of its divisors is an integer number (110520201).

Almost surely, 2^221040401 is an apocalyptic number.

It is an amenable number.

221040401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221040401 is an equidigital number, since it uses as much as digits as its factorization.

221040401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221040401 is about 14867.4275178997. The cubic root of 221040401 is about 604.6311993123.

Adding to 221040401 its reverse (104040122), we get a palindrome (325080523).

It can be divided in two parts, 22 and 1040401, that multiplied together give a palindrome (22888822).

The spelling of 221040401 in words is "two hundred twenty-one million, forty thousand, four hundred one".