221417431 has 4 divisors (see below), whose sum is σ = 233071000. Its totient is φ = 209763864.

The previous prime is 221417429. The next prime is 221417437. The reversal of 221417431 is 134714122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221417431 - 2¹ = 221417429 is a prime.

It is a super-2 number, since 2×221417431² = 98051357501279522, 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 = 221417396 and 221417405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221417437) 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 3 ways as a sum of consecutive naturals, for example, 5826756 + ... + 5826793.

It is an arithmetic number, because the mean of its divisors is an integer number (58267750).

Almost surely, 2^221417431 is an apocalyptic number.

221417431 is a deficient number, since it is larger than the sum of its proper divisors (11653569).

221417431 is a wasteful number, since it uses less digits than its factorization.

221417431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11653568.

The product of its digits is 1344, while the sum is 25.

The square root of 221417431 is about 14880.1018477697. The cubic root of 221417431 is about 604.9747784491.

The spelling of 221417431 in words is "two hundred twenty-one million, four hundred seventeen thousand, four hundred thirty-one".