21754267007640 has 128 divisors (see below), whose sum is σ = 66658775904000. Its totient is φ = 5677909959168.

The previous prime is 21754267007639. The next prime is 21754267007663. The reversal of 21754267007640 is 4670076245712.

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, 5087494 + ... + 8330133.

It is an arithmetic number, because the mean of its divisors is an integer number (520771686750).

Almost surely, 2^{21754267007640} is an apocalyptic number.

21754267007640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21754267007640 is an abundant number, since it is smaller than the sum of its proper divisors (44904508896360).

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

21754267007640 is a wasteful number, since it uses less digits than its factorization.

21754267007640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13417929 (or 13417925 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 51.

The spelling of 21754267007640 in words is "twenty-one trillion, seven hundred fifty-four billion, two hundred sixty-seven million, seven thousand, six hundred forty".