21917219389604 has 192 divisors, whose sum is σ = 49711424716800. Its totient is φ = 8205414912000.

The previous prime is 21917219389591. The next prime is 21917219389627. The reversal of 21917219389604 is 40698391271912.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 798456872 + ... + 798484320.

It is an arithmetic number, because the mean of its divisors is an integer number (258913670400).

Almost surely, 2^{21917219389604} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21917219389604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24855712358400).

21917219389604 is an abundant number, since it is smaller than the sum of its proper divisors (27794205327196).

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

21917219389604 is a wasteful number, since it uses less digits than its factorization.

21917219389604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28090 (or 28088 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 21917219389604 in words is "twenty-one trillion, nine hundred seventeen billion, two hundred nineteen million, three hundred eighty-nine thousand, six hundred four".