221473733 has 4 divisors (see below), whose sum is σ = 238510188. Its totient is φ = 204437280.

The previous prime is 221473727. The next prime is 221473757. The reversal of 221473733 is 337374122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 337374122 = 2 ⋅168687061.

It can be written as a sum of positive squares in 2 ways, for example, as 64272289 + 157201444 = 8017^2 + 12538^2 .

It is a cyclic number.

It is not a de Polignac number, because 221473733 - 2¹⁰ = 221472709 is a prime.

It is a super-2 number, since 2×221473733² = 98101228817910578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221473733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221473033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8518208 + ... + 8518233.

It is an arithmetic number, because the mean of its divisors is an integer number (59627547).

Almost surely, 2^221473733 is an apocalyptic number.

It is an amenable number.

221473733 is a deficient number, since it is larger than the sum of its proper divisors (17036455).

221473733 is a wasteful number, since it uses less digits than its factorization.

221473733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17036454.

The product of its digits is 21168, while the sum is 32.

The square root of 221473733 is about 14881.9935828504. The cubic root of 221473733 is about 605.0260517434.

The spelling of 221473733 in words is "two hundred twenty-one million, four hundred seventy-three thousand, seven hundred thirty-three".