221427453 has 16 divisors (see below), whose sum is σ = 318217536. Its totient is φ = 136147200.

The previous prime is 221427403. The next prime is 221427467. The reversal of 221427453 is 354724122.

It is not a de Polignac number, because 221427453 - 2¹⁷ = 221296381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221427453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221427403) 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, 77653 + ... + 80453.

It is an arithmetic number, because the mean of its divisors is an integer number (19888596).

Almost surely, 2^221427453 is an apocalyptic number.

It is an amenable number.

221427453 is a deficient number, since it is larger than the sum of its proper divisors (96790083).

221427453 is a wasteful number, since it uses less digits than its factorization.

221427453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844.

The product of its digits is 13440, while the sum is 30.

The square root of 221427453 is about 14880.4386024069. The cubic root of 221427453 is about 604.9839059535.

The spelling of 221427453 in words is "two hundred twenty-one million, four hundred twenty-seven thousand, four hundred fifty-three".