19019821830 has 16 divisors (see below), whose sum is σ = 45647572464. Its totient is φ = 5071952480.

The previous prime is 19019821811. The next prime is 19019821853. The reversal of 19019821830 is 3812891091.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316997001 + ... + 316997060.

It is an arithmetic number, because the mean of its divisors is an integer number (2852973279).

Almost surely, 2^19019821830 is an apocalyptic number.

19019821830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19019821830 is an abundant number, since it is smaller than the sum of its proper divisors (26627750634).

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

19019821830 is a wasteful number, since it uses less digits than its factorization.

19019821830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633994071.

The product of its (nonzero) digits is 31104, while the sum is 42.

The spelling of 19019821830 in words is "nineteen billion, nineteen million, eight hundred twenty-one thousand, eight hundred thirty".