21055332215240 has 16 divisors (see below), whose sum is σ = 47374497484380. Its totient is φ = 8422132886080.

The previous prime is 21055332215221. The next prime is 21055332215243. The reversal of 21055332215240 is 4251223355012.

21055332215240 is digitally balanced in base 5, 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 20554490094436 + 500842120804 = 4533706^2 + 707702^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21055332215240.

It is not an unprimeable number, because it can be changed into a prime (21055332215243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263191652651 + ... + 263191652730.

Almost surely, 2^{21055332215240} is an apocalyptic number.

21055332215240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21055332215240 is an abundant number, since it is smaller than the sum of its proper divisors (26319165269140).

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

21055332215240 is a wasteful number, since it uses less digits than its factorization.

21055332215240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526383305392 (or 526383305388 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21055332215240 in words is "twenty-one trillion, fifty-five billion, three hundred thirty-two million, two hundred fifteen thousand, two hundred forty".