1821100512 has 96 divisors (see below), whose sum is σ = 5959989504. Its totient is φ = 473011200.

The previous prime is 1821100507. The next prime is 1821100531. The reversal of 1821100512 is 2150011281.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115789 + ... + 130572.

It is an arithmetic number, because the mean of its divisors is an integer number (62083224).

Almost surely, 2^1821100512 is an apocalyptic number.

1821100512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821100512 is an abundant number, since it is smaller than the sum of its proper divisors (4138888992).

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

1821100512 is a wasteful number, since it uses less digits than its factorization.

1821100512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246392 (or 246384 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 1821100512 is about 42674.3542657648. The cubic root of 1821100512 is about 1221.1751893891.

Adding to 1821100512 its reverse (2150011281), we get a palindrome (3971111793).

The spelling of 1821100512 in words is "one billion, eight hundred twenty-one million, one hundred thousand, five hundred twelve".