19250221 has 2 divisors, whose sum is σ = 19250222. Its totient is φ = 19250220.

The previous prime is 19250219. The next prime is 19250243. The reversal of 19250221 is 12205291.

It is an a-pointer prime, because the next prime (19250243) can be obtained adding 19250221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 13225 = 4386^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 19250221 - 2¹ = 19250219 is a prime.

Together with 19250219, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 19250192 and 19250201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19250201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9625110 + 9625111.

It is an arithmetic number, because the mean of its divisors is an integer number (9625111).

Almost surely, 2^19250221 is an apocalyptic number.

It is an amenable number.

19250221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19250221 is an equidigital number, since it uses as much as digits as its factorization.

19250221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 19250221 is about 4387.5073789112. The cubic root of 19250221 is about 268.0064461582.

The spelling of 19250221 in words is "nineteen million, two hundred fifty thousand, two hundred twenty-one".