19221868 has 6 divisors (see below), whose sum is σ = 33638276. Its totient is φ = 9610932.

The previous prime is 19221827. The next prime is 19221913. The reversal of 19221868 is 86812291.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2402730 + ... + 2402737.

Almost surely, 2^19221868 is an apocalyptic number.

It is an amenable number.

19221868 is a deficient number, since it is larger than the sum of its proper divisors (14416408).

19221868 is a wasteful number, since it uses less digits than its factorization.

19221868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805471 (or 4805469 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 19221868 is about 4384.2750826106. The cubic root of 19221868 is about 267.8748022931.

The spelling of 19221868 in words is "nineteen million, two hundred twenty-one thousand, eight hundred sixty-eight".