21819489509375 has 24 divisors (see below), whose sum is σ = 27275176651968. Its totient is φ = 17453952900000.

The previous prime is 21819489509347. The next prime is 21819489509387. The reversal of 21819489509375 is 57390598491812.

It is not a de Polignac number, because 21819489509375 - 2¹² = 21819489505279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21819489509299 and 21819489509308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33524549 + ... + 34169201.

It is an arithmetic number, because the mean of its divisors is an integer number (1136465693832).

Almost surely, 2^{21819489509375} is an apocalyptic number.

21819489509375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21819489509375 is a deficient number, since it is larger than the sum of its proper divisors (5455687142593).

21819489509375 is an frugal number, since it uses more digits than its factorization.

21819489509375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655509 (or 655489 counting only the distinct ones).

The product of its (nonzero) digits is 195955200, while the sum is 71.

The spelling of 21819489509375 in words is "twenty-one trillion, eight hundred nineteen billion, four hundred eighty-nine million, five hundred nine thousand, three hundred seventy-five".