19201223251 has 12 divisors (see below), whose sum is σ = 22381635960. Its totient is φ = 16424651040.

The previous prime is 19201223231. The next prime is 19201223273. The reversal of 19201223251 is 15232210291.

It is not a de Polignac number, because 19201223251 - 2¹¹ = 19201221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19201223201) 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 in 11 ways as a sum of consecutive naturals, for example, 374986 + ... + 423103.

It is an arithmetic number, because the mean of its divisors is an integer number (1865136330).

Almost surely, 2^19201223251 is an apocalyptic number.

19201223251 is a deficient number, since it is larger than the sum of its proper divisors (3180412709).

19201223251 is an equidigital number, since it uses as much as digits as its factorization.

19201223251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798594 (or 798587 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 19201223251 in words is "nineteen billion, two hundred one million, two hundred twenty-three thousand, two hundred fifty-one".