221738733 has 24 divisors (see below), whose sum is σ = 327468960. Its totient is φ = 144549600.

The previous prime is 221738729. The next prime is 221738749. The reversal of 221738733 is 337837122.

It is not a de Polignac number, because 221738733 - 2² = 221738729 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221738773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73978 + ... + 76916.

It is an arithmetic number, because the mean of its divisors is an integer number (13644540).

Almost surely, 2^221738733 is an apocalyptic number.

It is an amenable number.

221738733 is a deficient number, since it is larger than the sum of its proper divisors (105730227).

221738733 is a wasteful number, since it uses less digits than its factorization.

221738733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129 (or 3126 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 221738733 is about 14890.8942981945. The cubic root of 221738733 is about 605.2672662006.

The spelling of 221738733 in words is "two hundred twenty-one million, seven hundred thirty-eight thousand, seven hundred thirty-three".