21331322082 has 64 divisors (see below), whose sum is σ = 54601482240. Its totient is φ = 6046660368.

The previous prime is 21331322069. The next prime is 21331322083. The reversal of 21331322082 is 28022313312.

It is a happy number.

21331322082 is a `hidden beast` number, since 2 + 1 + 331 + 322 + 0 + 8 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21331322083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174168 + ... + 270179.

It is an arithmetic number, because the mean of its divisors is an integer number (853148160).

Almost surely, 2^21331322082 is an apocalyptic number.

21331322082 is an abundant number, since it is smaller than the sum of its proper divisors (33270160158).

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

21331322082 is a wasteful number, since it uses less digits than its factorization.

21331322082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444492 (or 444486 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21331322082 its reverse (28022313312), we get a palindrome (49353635394).

The spelling of 21331322082 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, eighty-two".