221000453 has 4 divisors (see below), whose sum is σ = 222356448. Its totient is φ = 219644460.

The previous prime is 221000441. The next prime is 221000471. The reversal of 221000453 is 354000122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221000453 - 2²⁴ = 204223237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677753 + ... + 678078.

It is an arithmetic number, because the mean of its divisors is an integer number (55589112).

Almost surely, 2^221000453 is an apocalyptic number.

It is an amenable number.

221000453 is a deficient number, since it is larger than the sum of its proper divisors (1355995).

221000453 is a wasteful number, since it uses less digits than its factorization.

221000453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355994.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 221000453 is about 14866.0839833495. The cubic root of 221000453 is about 604.5947726949.

Adding to 221000453 its reverse (354000122), we get a palindrome (575000575).

The spelling of 221000453 in words is "two hundred twenty-one million, four hundred fifty-three", and thus it is an aban number.