1821028512 has 24 divisors (see below), whose sum is σ = 4780200096. Its totient is φ = 607009472.

The previous prime is 1821028501. The next prime is 1821028553. The reversal of 1821028512 is 2158201281.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1821028512² = 6632289683033868288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1821028512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9484428 + ... + 9484619.

It is an arithmetic number, because the mean of its divisors is an integer number (199175004).

Almost surely, 2^1821028512 is an apocalyptic number.

1821028512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821028512 is an abundant number, since it is smaller than the sum of its proper divisors (2959171584).

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

1821028512 is a wasteful number, since it uses less digits than its factorization.

1821028512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18969060 (or 18969052 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 1821028512 is about 42673.5106594243. The cubic root of 1821028512 is about 1221.1590954994.

Adding to 1821028512 its reverse (2158201281), we get a palindrome (3979229793).

The spelling of 1821028512 in words is "one billion, eight hundred twenty-one million, twenty-eight thousand, five hundred twelve".