221484431 has 8 divisors (see below), whose sum is σ = 253234080. Its totient is φ = 189762048.

The previous prime is 221484401. The next prime is 221484437. The reversal of 221484431 is 134484122.

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

It is not a de Polignac number, because 221484431 - 2¹⁰ = 221483407 is a prime.

It is a super-2 number, since 2×221484431² = 98110706350787522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221484394 and 221484403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221484437) 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, 15455 + ... + 26111.

It is an arithmetic number, because the mean of its divisors is an integer number (31654260).

Almost surely, 2^221484431 is an apocalyptic number.

221484431 is a deficient number, since it is larger than the sum of its proper divisors (31749649).

221484431 is a wasteful number, since it uses less digits than its factorization.

221484431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13633.

The product of its digits is 6144, while the sum is 29.

The square root of 221484431 is about 14882.3530061614. The cubic root of 221484431 is about 605.0357932515.

The spelling of 221484431 in words is "two hundred twenty-one million, four hundred eighty-four thousand, four hundred thirty-one".