221044431 has 16 divisors (see below), whose sum is σ = 303220224. Its totient is φ = 143162304.

The previous prime is 221044391. The next prime is 221044451. The reversal of 221044431 is 134440122.

It is not a de Polignac number, because 221044431 - 2¹³ = 221036239 is a prime.

It is a super-2 number, since 2×221044431² = 97721280952227522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221044398 and 221044407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221044451) 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, 13596 + ... + 25038.

It is an arithmetic number, because the mean of its divisors is an integer number (18951264).

Almost surely, 2^221044431 is an apocalyptic number.

221044431 is a deficient number, since it is larger than the sum of its proper divisors (82175793).

221044431 is a wasteful number, since it uses less digits than its factorization.

221044431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11630.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221044431 is about 14867.5630484622. The cubic root of 221044431 is about 604.6348738275.

Adding to 221044431 its reverse (134440122), we get a palindrome (355484553).

The spelling of 221044431 in words is "two hundred twenty-one million, forty-four thousand, four hundred thirty-one".