221035431 has 8 divisors (see below), whose sum is σ = 294786544. Its totient is φ = 147320640.

The previous prime is 221035421. The next prime is 221035439. The reversal of 221035431 is 134530122.

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

It is not a de Polignac number, because 221035431 - 2¹⁴ = 221019047 is a prime.

It is a super-2 number, since 2×221035431² = 97713323514711522, 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 = 221035398 and 221035407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221035439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12345 + ... + 24381.

It is an arithmetic number, because the mean of its divisors is an integer number (36848318).

Almost surely, 2^221035431 is an apocalyptic number.

221035431 is a deficient number, since it is larger than the sum of its proper divisors (73751113).

221035431 is a wasteful number, since it uses less digits than its factorization.

221035431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18161.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221035431 is about 14867.2603730479. The cubic root of 221035431 is about 604.6266676527.

Adding to 221035431 its reverse (134530122), we get a palindrome (355565553).

The spelling of 221035431 in words is "two hundred twenty-one million, thirty-five thousand, four hundred thirty-one".