1021868180 has 12 divisors (see below), whose sum is σ = 2145923220. Its totient is φ = 408747264.

The previous prime is 1021868179. The next prime is 1021868191. The reversal of 1021868180 is 818681201.

1021868180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 192543376 + 829324804 = 13876^2 + 28798^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1021868180.

It is a congruent number.

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, 25546685 + ... + 25546724.

It is an arithmetic number, because the mean of its divisors is an integer number (178826935).

Almost surely, 2^1021868180 is an apocalyptic number.

1021868180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021868180 is an abundant number, since it is smaller than the sum of its proper divisors (1124055040).

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

1021868180 is a wasteful number, since it uses less digits than its factorization.

1021868180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51093418 (or 51093416 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 35.

The square root of 1021868180 is about 31966.6729579417. The cubic root of 1021868180 is about 1007.2368943550.

The spelling of 1021868180 in words is "one billion, twenty-one million, eight hundred sixty-eight thousand, one hundred eighty".