221421453 has 16 divisors (see below), whose sum is σ = 322348032. Its totient is φ = 134078000.

The previous prime is 221421419. The next prime is 221421461. The reversal of 221421453 is 354124122.

It is a cyclic number.

It is not a de Polignac number, because 221421453 - 2¹³ = 221413261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421493) 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, 49708 + ... + 53978.

It is an arithmetic number, because the mean of its divisors is an integer number (20146752).

Almost surely, 2^221421453 is an apocalyptic number.

It is an amenable number.

221421453 is a deficient number, since it is larger than the sum of its proper divisors (100926579).

221421453 is a wasteful number, since it uses less digits than its factorization.

221421453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its digits is 1920, while the sum is 24.

The square root of 221421453 is about 14880.2369940804. The cubic root of 221421453 is about 604.9784415058.

Adding to 221421453 its reverse (354124122), we get a palindrome (575545575).

The spelling of 221421453 in words is "two hundred twenty-one million, four hundred twenty-one thousand, four hundred fifty-three".