21343561992 has 256 divisors, whose sum is σ = 63947520000. Its totient is φ = 6575696640.

The previous prime is 21343561991. The next prime is 21343561997. The reversal of 21343561992 is 29916534312.

21343561992 is a `hidden beast` number, since 21 + 3 + 4 + 3 + 5 + 619 + 9 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21343561991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43826373 + ... + 43826859.

It is an arithmetic number, because the mean of its divisors is an integer number (249795000).

Almost surely, 2^21343561992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21343561992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31973760000).

21343561992 is an abundant number, since it is smaller than the sum of its proper divisors (42603958008).

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

21343561992 is a wasteful number, since it uses less digits than its factorization.

21343561992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761 (or 751 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The spelling of 21343561992 in words is "twenty-one billion, three hundred forty-three million, five hundred sixty-one thousand, nine hundred ninety-two".