19473221 has 2 divisors, whose sum is σ = 19473222. Its totient is φ = 19473220.

The previous prime is 19473197. The next prime is 19473269. The reversal of 19473221 is 12237491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 2292196 = 4145^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 19473221 - 2¹⁸ = 19211077 is a prime.

It is a super-2 number, since 2×19473221² = 758412672229682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19473521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9736610 + 9736611.

It is an arithmetic number, because the mean of its divisors is an integer number (9736611).

Almost surely, 2^19473221 is an apocalyptic number.

It is an amenable number.

19473221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19473221 is an equidigital number, since it uses as much as digits as its factorization.

19473221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 19473221 is about 4412.8472667882. The cubic root of 19473221 is about 269.0373630058.

The spelling of 19473221 in words is "nineteen million, four hundred seventy-three thousand, two hundred twenty-one".