221894536 has 8 divisors (see below), whose sum is σ = 416052270. Its totient is φ = 110947264.

The previous prime is 221894509. The next prime is 221894539. The reversal of 221894536 is 635498122.

It can be written as a sum of positive squares in only one way, i.e., 204204100 + 17690436 = 14290^2 + 4206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (221894539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13868401 + ... + 13868416.

Almost surely, 2^221894536 is an apocalyptic number.

It is an amenable number.

221894536 is a deficient number, since it is larger than the sum of its proper divisors (194157734).

221894536 is a wasteful number, since it uses less digits than its factorization.

221894536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27736823 (or 27736819 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 221894536 is about 14896.1248652124. The cubic root of 221894536 is about 605.4089951267.

The spelling of 221894536 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, five hundred thirty-six".