221436373 has 8 divisors (see below), whose sum is σ = 242547480. Its totient is φ = 201223680.

The previous prime is 221436349. The next prime is 221436377. The reversal of 221436373 is 373634122.

It can be written as a sum of positive squares in 4 ways, for example, as 132756484 + 88679889 = 11522^2 + 9417^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221436373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221436377) 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, 224088 + ... + 225073.

It is an arithmetic number, because the mean of its divisors is an integer number (30318435).

Almost surely, 2^221436373 is an apocalyptic number.

It is an amenable number.

221436373 is a deficient number, since it is larger than the sum of its proper divisors (21111107).

221436373 is a wasteful number, since it uses less digits than its factorization.

221436373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449207.

The product of its digits is 18144, while the sum is 31.

The square root of 221436373 is about 14880.7383217366. The cubic root of 221436373 is about 604.9920295833.

The spelling of 221436373 in words is "two hundred twenty-one million, four hundred thirty-six thousand, three hundred seventy-three".