19021147866 has 80 divisors (see below), whose sum is σ = 48830527680. Its totient is φ = 5421193920.

The previous prime is 19021147823. The next prime is 19021147877. The reversal of 19021147866 is 66874112091.

It is a super-2 number, since 2×19021147866² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 443301 + ... + 484311.

It is an arithmetic number, because the mean of its divisors is an integer number (610381596).

Almost surely, 2^19021147866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19021147866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24415263840).

19021147866 is an abundant number, since it is smaller than the sum of its proper divisors (29809379814).

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

19021147866 is a wasteful number, since it uses less digits than its factorization.

19021147866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41441 (or 41432 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 19021147866 in words is "nineteen billion, twenty-one million, one hundred forty-seven thousand, eight hundred sixty-six".