19370021906 has 8 divisors (see below), whose sum is σ = 29055946764. Its totient is φ = 9684706320.

The previous prime is 19370021897. The next prime is 19370021917. The reversal of 19370021906 is 60912007391.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17718005881 + 1652016025 = 133109^2 + 40645^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19370021906.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 62165 + ... + 206408.

Almost surely, 2^19370021906 is an apocalyptic number.

19370021906 is a deficient number, since it is larger than the sum of its proper divisors (9685924858).

19370021906 is a wasteful number, since it uses less digits than its factorization.

19370021906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304636.

The product of its (nonzero) digits is 20412, while the sum is 38.

The spelling of 19370021906 in words is "nineteen billion, three hundred seventy million, twenty-one thousand, nine hundred six".