21672783733940 has 24 divisors (see below), whose sum is σ = 45513012438600. Its totient is φ = 8669081760768.

The previous prime is 21672783733927. The next prime is 21672783733967. The reversal of 21672783733940 is 4933738727612.

It can be written as a sum of positive squares in 4 ways, for example, as 2393413208356 + 19279370525584 = 1547066^2 + 4390828^2 .

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, 4067336 + ... + 7738784.

It is an arithmetic number, because the mean of its divisors is an integer number (1896375518275).

Almost surely, 2^{21672783733940} is an apocalyptic number.

21672783733940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21672783733940 is an abundant number, since it is smaller than the sum of its proper divisors (23840228704660).

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

21672783733940 is a wasteful number, since it uses less digits than its factorization.

21672783733940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966611 (or 3966609 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 62.

The spelling of 21672783733940 in words is "twenty-one trillion, six hundred seventy-two billion, seven hundred eighty-three million, seven hundred thirty-three thousand, nine hundred forty".