19493221 has 24 divisors (see below), whose sum is σ = 23088800. Its totient is φ = 16394400.

The previous prime is 19493219. The next prime is 19493231. The reversal of 19493221 is 12239491.

It is not a de Polignac number, because 19493221 - 2¹ = 19493219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19493231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140170 + ... + 140308.

Almost surely, 2^19493221 is an apocalyptic number.

19493221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19493221 is a deficient number, since it is larger than the sum of its proper divisors (3595579).

19493221 is a wasteful number, since it uses less digits than its factorization.

19493221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 230 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 19493221 is about 4415.1127958411. The cubic root of 19493221 is about 269.1294365634.

The spelling of 19493221 in words is "nineteen million, four hundred ninety-three thousand, two hundred twenty-one".