221143401 has 12 divisors (see below), whose sum is σ = 325457028. Its totient is φ = 144646944.

The previous prime is 221143399. The next prime is 221143409. The reversal of 221143401 is 104341122.

221143401 is a `hidden beast` number, since 221 + 1 + 43 + 401 = 666.

221143401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 129960000 + 91183401 = 11400^2 + 9549^2 .

It is not a de Polignac number, because 221143401 - 2¹ = 221143399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221143409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231330 + ... + 232283.

It is an arithmetic number, because the mean of its divisors is an integer number (27121419).

Almost surely, 2^221143401 is an apocalyptic number.

It is an amenable number.

221143401 is a deficient number, since it is larger than the sum of its proper divisors (104313627).

221143401 is a wasteful number, since it uses less digits than its factorization.

221143401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463672 (or 463669 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 221143401 is about 14870.8910627440. The cubic root of 221143401 is about 604.7250997071.

Adding to 221143401 its reverse (104341122), we get a palindrome (325484523).

The spelling of 221143401 in words is "two hundred twenty-one million, one hundred forty-three thousand, four hundred one".