221302401 has 16 divisors (see below), whose sum is σ = 303578496. Its totient is φ = 143335296.

The previous prime is 221302391. The next prime is 221302409. The reversal of 221302401 is 104203122.

It is not a de Polignac number, because 221302401 - 2⁶ = 221302337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221302409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9621 + ... + 23133.

It is an arithmetic number, because the mean of its divisors is an integer number (18973656).

Almost surely, 2^221302401 is an apocalyptic number.

It is an amenable number.

221302401 is a deficient number, since it is larger than the sum of its proper divisors (82276095).

221302401 is a wasteful number, since it uses less digits than its factorization.

221302401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13672.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221302401 is about 14876.2361167064. The cubic root of 221302401 is about 604.8699955163.

Adding to 221302401 its reverse (104203122), we get a palindrome (325505523).

It can be divided in two parts, 22130 and 2401, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 221302401 in words is "two hundred twenty-one million, three hundred two thousand, four hundred one".