221431453 has 4 divisors (see below), whose sum is σ = 233085760. Its totient is φ = 209777148.

The previous prime is 221431439. The next prime is 221431487. The reversal of 221431453 is 354134122.

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 221431453 - 2¹⁷ = 221300381 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 (221431423) 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, 5827125 + ... + 5827162.

It is an arithmetic number, because the mean of its divisors is an integer number (58271440).

Almost surely, 2^221431453 is an apocalyptic number.

It is an amenable number.

221431453 is a deficient number, since it is larger than the sum of its proper divisors (11654307).

221431453 is a wasteful number, since it uses less digits than its factorization.

221431453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11654306.

The product of its digits is 2880, while the sum is 25.

The square root of 221431453 is about 14880.5730064403. The cubic root of 221431453 is about 604.9875488638.

Adding to 221431453 its reverse (354134122), we get a palindrome (575565575).

The spelling of 221431453 in words is "two hundred twenty-one million, four hundred thirty-one thousand, four hundred fifty-three".