221352212 has 12 divisors (see below), whose sum is σ = 387526356. Its totient is φ = 110630400.

The previous prime is 221352211. The next prime is 221352217. The reversal of 221352212 is 212253122.

It can be written as a sum of positive squares in 2 ways, for example, as 148693636 + 72658576 = 12194^2 + 8524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221352211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962 + ... + 21062.

It is an arithmetic number, because the mean of its divisors is an integer number (32293863).

Almost surely, 2^221352212 is an apocalyptic number.

It is an amenable number.

221352212 is a deficient number, since it is larger than the sum of its proper divisors (166174144).

221352212 is a wasteful number, since it uses less digits than its factorization.

221352212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22858 (or 22856 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 221352212 is about 14877.9102027133. The cubic root of 221352212 is about 604.9153737243.

The spelling of 221352212 in words is "two hundred twenty-one million, three hundred fifty-two thousand, two hundred twelve".