19021951540 has 24 divisors (see below), whose sum is σ = 41234683392. Its totient is φ = 7363335840.

The previous prime is 19021951493. The next prime is 19021951561. The reversal of 19021951540 is 4515912091.

It is a self number, because there is not a number n which added to its sum of digits gives 19021951540.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15339664 + ... + 15340903.

It is an arithmetic number, because the mean of its divisors is an integer number (1718111808).

Almost surely, 2^19021951540 is an apocalyptic number.

19021951540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19021951540 is an abundant number, since it is smaller than the sum of its proper divisors (22212731852).

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

19021951540 is a wasteful number, since it uses less digits than its factorization.

19021951540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30680607 (or 30680605 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 37.

The spelling of 19021951540 in words is "nineteen billion, twenty-one million, nine hundred fifty-one thousand, five hundred forty".