21787546662140 has 96 divisors (see below), whose sum is σ = 52364664852864. Its totient is φ = 7459373306880.

The previous prime is 21787546662127. The next prime is 21787546662151. The reversal of 21787546662140 is 4126664578712.

It is a self number, because there is not a number n which added to its sum of digits gives 21787546662140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280884242 + ... + 280961798.

It is an arithmetic number, because the mean of its divisors is an integer number (545465258884).

Almost surely, 2^{21787546662140} is an apocalyptic number.

21787546662140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21787546662140 is an abundant number, since it is smaller than the sum of its proper divisors (30577118190724).

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

21787546662140 is a wasteful number, since it uses less digits than its factorization.

21787546662140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80407 (or 80405 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 59.

The spelling of 21787546662140 in words is "twenty-one trillion, seven hundred eighty-seven billion, five hundred forty-six million, six hundred sixty-two thousand, one hundred forty".