1821099240576 has 384 divisors, whose sum is σ = 6666841584000. Its totient is φ = 473011660800.

The previous prime is 1821099240523. The next prime is 1821099240581. The reversal of 1821099240576 is 6750429901281.

It is a happy number.

1821099240576 is a `hidden beast` number, since 1 + 8 + 21 + 0 + 9 + 9 + 2 + 40 + 576 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4137006 + ... + 4555986.

It is an arithmetic number, because the mean of its divisors is an integer number (17361566625).

Almost surely, 2^{1821099240576} is an apocalyptic number.

1821099240576 is a gapful number since it is divisible by the number (16) 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 1821099240576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3333420792000).

1821099240576 is an abundant number, since it is smaller than the sum of its proper divisors (4845742343424).

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

1821099240576 is a wasteful number, since it uses less digits than its factorization.

1821099240576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419033 (or 419004 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 1821099240576 in words is "one trillion, eight hundred twenty-one billion, ninety-nine million, two hundred forty thousand, five hundred seventy-six".