21030880218500 has 24 divisors (see below), whose sum is σ = 45931442398296. Its totient is φ = 8412352087200.

The previous prime is 21030880218487. The next prime is 21030880218521. The reversal of 21030880218500 is 581208803012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3908299671364 + 17122580547136 = 1976942^2 + 4137944^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21030879719 + ... + 21030880718.

It is an arithmetic number, because the mean of its divisors is an integer number (1913810099929).

Almost surely, 2^{21030880218500} is an apocalyptic number.

21030880218500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030880218500 is an abundant number, since it is smaller than the sum of its proper divisors (24900562179796).

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

21030880218500 is a wasteful number, since it uses less digits than its factorization.

21030880218500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42061760456 (or 42061760444 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 21030880218500 in words is "twenty-one trillion, thirty billion, eight hundred eighty million, two hundred eighteen thousand, five hundred".