221843252 has 6 divisors (see below), whose sum is σ = 388225698. Its totient is φ = 110921624.

The previous prime is 221843233. The next prime is 221843291. The reversal of 221843252 is 252348122.

221843252 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 190550416 + 31292836 = 13804^2 + 5594^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27730403 + ... + 27730410.

It is an arithmetic number, because the mean of its divisors is an integer number (64704283).

Almost surely, 2^221843252 is an apocalyptic number.

It is an amenable number.

221843252 is a deficient number, since it is larger than the sum of its proper divisors (166382446).

221843252 is a wasteful number, since it uses less digits than its factorization.

221843252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55460817 (or 55460815 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 221843252 is about 14894.4033784506. The cubic root of 221843252 is about 605.3623510653.

The spelling of 221843252 in words is "two hundred twenty-one million, eight hundred forty-three thousand, two hundred fifty-two".