19213722906 has 48 divisors (see below), whose sum is σ = 47054028960. Its totient is φ = 5200705440.

The previous prime is 19213722893. The next prime is 19213722917. The reversal of 19213722906 is 60922731291.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1714225 + ... + 1725396.

It is an arithmetic number, because the mean of its divisors is an integer number (980292270).

Almost surely, 2^19213722906 is an apocalyptic number.

19213722906 is an abundant number, since it is smaller than the sum of its proper divisors (27840306054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19213722906 is a wasteful number, since it uses less digits than its factorization.

19213722906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439659 (or 3439652 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 19213722906 in words is "nineteen billion, two hundred thirteen million, seven hundred twenty-two thousand, nine hundred six".