21323752340 has 96 divisors (see below), whose sum is σ = 49623840000. Its totient is φ = 7631769600.

The previous prime is 21323752337. The next prime is 21323752397. The reversal of 21323752340 is 4325732312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21323752297 and 21323752306.

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, 17072036 + ... + 17073284.

It is an arithmetic number, because the mean of its divisors is an integer number (516915000).

Almost surely, 2^21323752340 is an apocalyptic number.

21323752340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323752340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24811920000).

21323752340 is an abundant number, since it is smaller than the sum of its proper divisors (28300087660).

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

21323752340 is a wasteful number, since it uses less digits than its factorization.

21323752340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433 (or 2431 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 32.

The spelling of 21323752340 in words is "twenty-one billion, three hundred twenty-three million, seven hundred fifty-two thousand, three hundred forty".