221003431 has 8 divisors (see below), whose sum is σ = 241216128. Its totient is φ = 200811000.

The previous prime is 221003423. The next prime is 221003437. The reversal of 221003431 is 134300122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221003431 - 2³ = 221003423 is a prime.

It is a super-2 number, since 2×221003431² = 97685033027543522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221003437) 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, 26116 + ... + 33526.

It is an arithmetic number, because the mean of its divisors is an integer number (30152016).

Almost surely, 2^221003431 is an apocalyptic number.

221003431 is a deficient number, since it is larger than the sum of its proper divisors (20212697).

221003431 is a wasteful number, since it uses less digits than its factorization.

221003431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10133.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221003431 is about 14866.1841438884. The cubic root of 221003431 is about 604.5974883381.

Adding to 221003431 its reverse (134300122), we get a palindrome (355303553).

The spelling of 221003431 in words is "two hundred twenty-one million, three thousand, four hundred thirty-one".