21396322782 has 12 divisors (see below), whose sum is σ = 46358699400. Its totient is φ = 7132107588.

The previous prime is 21396322781. The next prime is 21396322877. The reversal of 21396322782 is 28722369312.

21396322782 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 632 + 2 + 7 + 8 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396322781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594342282 + ... + 594342317.

It is an arithmetic number, because the mean of its divisors is an integer number (3863224950).

Almost surely, 2^21396322782 is an apocalyptic number.

21396322782 is an abundant number, since it is smaller than the sum of its proper divisors (24962376618).

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

21396322782 is a wasteful number, since it uses less digits than its factorization.

21396322782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188684607 (or 1188684604 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 21396322782 in words is "twenty-one billion, three hundred ninety-six million, three hundred twenty-two thousand, seven hundred eighty-two".