19221623 has 2 divisors, whose sum is σ = 19221624. Its totient is φ = 19221622.

The previous prime is 19221619. The next prime is 19221641. The reversal of 19221623 is 32612291.

It is a weak prime.

It is an emirp because it is prime and its reverse (32612291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19221623 - 2² = 19221619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19221592 and 19221601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19281623) 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, 9610811 + 9610812.

It is an arithmetic number, because the mean of its divisors is an integer number (9610812).

Almost surely, 2^19221623 is an apocalyptic number.

19221623 is a deficient number, since it is larger than the sum of its proper divisors (1).

19221623 is an equidigital number, since it uses as much as digits as its factorization.

19221623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 19221623 is about 4384.2471417565. The cubic root of 19221623 is about 267.8736641865.

The spelling of 19221623 in words is "nineteen million, two hundred twenty-one thousand, six hundred twenty-three".