21548403768340 has 24 divisors (see below), whose sum is σ = 45252154694880. Its totient is φ = 8619264977568.

The previous prime is 21548403768323. The next prime is 21548403768391. The reversal of 21548403768340 is 4386730484512.

It is a congruent number.

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, 4188870 + ... + 7787389.

It is an arithmetic number, because the mean of its divisors is an integer number (1885506445620).

Almost surely, 2^{21548403768340} is an apocalyptic number.

21548403768340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21548403768340 is an abundant number, since it is smaller than the sum of its proper divisors (23703750926540).

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

21548403768340 is a wasteful number, since it uses less digits than its factorization.

21548403768340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12066231 (or 12066229 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 21548403768340 in words is "twenty-one trillion, five hundred forty-eight billion, four hundred three million, seven hundred sixty-eight thousand, three hundred forty".