19242121 has 2 divisors, whose sum is σ = 19242122. Its totient is φ = 19242120.

The previous prime is 19242107. The next prime is 19242133. The reversal of 19242121 is 12124291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 7096896 = 3485^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 19242121 - 2⁹ = 19241609 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19242092 and 19242101.

It is not a weakly prime, because it can be changed into another prime (19242101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9621060 + 9621061.

It is an arithmetic number, because the mean of its divisors is an integer number (9621061).

Almost surely, 2^19242121 is an apocalyptic number.

It is an amenable number.

19242121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19242121 is an equidigital number, since it uses as much as digits as its factorization.

19242121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 19242121 is about 4386.5842064185. The cubic root of 19242121 is about 267.9688508016.

It can be divided in two parts, 1924 and 2121, that multiplied together give a palindrome (4080804).

The spelling of 19242121 in words is "nineteen million, two hundred forty-two thousand, one hundred twenty-one".