21546880068740 has 24 divisors (see below), whose sum is σ = 48729098002200. Its totient is φ = 7955771102208.

The previous prime is 21546880068737. The next prime is 21546880068773. The reversal of 21546880068740 is 4786008864512.

It can be written as a sum of positive squares in 4 ways, for example, as 195512540224 + 21351367528516 = 442168^2 + 4620754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21546880068740.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41436307565 + ... + 41436308084.

It is an arithmetic number, because the mean of its divisors is an integer number (2030379083425).

Almost surely, 2^{21546880068740} is an apocalyptic number.

21546880068740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21546880068740 is an abundant number, since it is smaller than the sum of its proper divisors (27182217933460).

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

21546880068740 is a wasteful number, since it uses less digits than its factorization.

21546880068740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82872615671 (or 82872615669 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 59.

The spelling of 21546880068740 in words is "twenty-one trillion, five hundred forty-six billion, eight hundred eighty million, sixty-eight thousand, seven hundred forty".