21869260776540 has 72 divisors (see below), whose sum is σ = 66340894707360. Its totient is φ = 5831439179904.

The previous prime is 21869260776523. The next prime is 21869260776547. The reversal of 21869260776540 is 4567706296812.

21869260776540 is a `hidden beast` number, since 2 + 1 + 8 + 69 + 26 + 0 + 7 + 7 + 6 + 540 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869260776547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 888024 + ... + 6672863.

It is an arithmetic number, because the mean of its divisors is an integer number (921401315380).

Almost surely, 2^{21869260776540} is an apocalyptic number.

21869260776540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21869260776540 is an abundant number, since it is smaller than the sum of its proper divisors (44471633930820).

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

21869260776540 is a wasteful number, since it uses less digits than its factorization.

21869260776540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576971 (or 7576966 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 21869260776540 in words is "twenty-one trillion, eight hundred sixty-nine billion, two hundred sixty million, seven hundred seventy-six thousand, five hundred forty".