221407401 has 16 divisors (see below), whose sum is σ = 298771200. Its totient is φ = 145835088.

The previous prime is 221407379. The next prime is 221407411. The reversal of 221407401 is 104704122.

It is a happy number.

It is not a de Polignac number, because 221407401 - 2⁷ = 221407273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221407411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93490 + ... + 95828.

It is an arithmetic number, because the mean of its divisors is an integer number (18673200).

Almost surely, 2^221407401 is an apocalyptic number.

It is an amenable number.

221407401 is a deficient number, since it is larger than the sum of its proper divisors (77363799).

221407401 is a wasteful number, since it uses less digits than its factorization.

221407401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 221407401 is about 14879.7648166898. The cubic root of 221407401 is about 604.9656433829.

The spelling of 221407401 in words is "two hundred twenty-one million, four hundred seven thousand, four hundred one".