221454431 has 8 divisors (see below), whose sum is σ = 242120784. Its totient is φ = 200877120.

The previous prime is 221454403. The next prime is 221454437. The reversal of 221454431 is 134454122.

221454431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221454431 is a prime.

It is a super-2 number, since 2×221454431² = 98084130019067522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221454431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221454437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17000 + ... + 27053.

It is an arithmetic number, because the mean of its divisors is an integer number (30265098).

Almost surely, 2^221454431 is an apocalyptic number.

221454431 is a deficient number, since it is larger than the sum of its proper divisors (20666353).

221454431 is a wasteful number, since it uses less digits than its factorization.

221454431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44521.

The product of its digits is 3840, while the sum is 26.

The square root of 221454431 is about 14881.3450668950. The cubic root of 221454431 is about 605.0084747122.

The spelling of 221454431 in words is "two hundred twenty-one million, four hundred fifty-four thousand, four hundred thirty-one".