219963221 has 4 divisors (see below), whose sum is σ = 232902252. Its totient is φ = 207024192.

The previous prime is 219963193. The next prime is 219963223. The reversal of 219963221 is 122369912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196392196 + 23571025 = 14014^2 + 4855^2 .

It is a cyclic number.

It is not a de Polignac number, because 219963221 - 2⁶ = 219963157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219963223) 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, 6469490 + ... + 6469523.

It is an arithmetic number, because the mean of its divisors is an integer number (58225563).

Almost surely, 2^219963221 is an apocalyptic number.

It is an amenable number.

219963221 is a deficient number, since it is larger than the sum of its proper divisors (12939031).

219963221 is a wasteful number, since it uses less digits than its factorization.

219963221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12939030.

The product of its digits is 11664, while the sum is 35.

The square root of 219963221 is about 14831.1571025325. The cubic root of 219963221 is about 603.6474312198.

The spelling of 219963221 in words is "two hundred nineteen million, nine hundred sixty-three thousand, two hundred twenty-one".