19021213640 has 384 divisors, whose sum is σ = 54985029120. Its totient is φ = 5846630400.

The previous prime is 19021213621. The next prime is 19021213643. The reversal of 19021213640 is 4631212091.

It is not an unprimeable number, because it can be changed into a prime (19021213643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 51828737 + ... + 51829103.

It is an arithmetic number, because the mean of its divisors is an integer number (143190180).

Almost surely, 2^19021213640 is an apocalyptic number.

19021213640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19021213640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27492514560).

19021213640 is an abundant number, since it is smaller than the sum of its proper divisors (35963815480).

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

19021213640 is a wasteful number, since it uses less digits than its factorization.

19021213640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 19021213640 in words is "nineteen billion, twenty-one million, two hundred thirteen thousand, six hundred forty".