19225021979 has 2 divisors, whose sum is σ = 19225021980. Its totient is φ = 19225021978.

The previous prime is 19225021967. The next prime is 19225022051. The reversal of 19225021979 is 97912052291.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19225021979 is a prime.

It is not a weakly prime, because it can be changed into another prime (19225021909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9612510989 + 9612510990.

It is an arithmetic number, because the mean of its divisors is an integer number (9612510990).

Almost surely, 2^19225021979 is an apocalyptic number.

19225021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

19225021979 is an equidigital number, since it uses as much as digits as its factorization.

19225021979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 47.

The spelling of 19225021979 in words is "nineteen billion, two hundred twenty-five million, twenty-one thousand, nine hundred seventy-nine".