21539322 has 36 divisors (see below), whose sum is σ = 54290106. Its totient is φ = 6153840.

The previous prime is 21539321. The next prime is 21539333. The reversal of 21539322 is 22393512.

It can be written as a sum of positive squares in only one way, i.e., 21538881 + 441 = 4641^2 + 21^2 .

It is not an unprimeable number, because it can be changed into a prime (21539321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11329 + ... + 13092.

Almost surely, 2^21539322 is an apocalyptic number.

21539322 is an abundant number, since it is smaller than the sum of its proper divisors (32750784).

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

21539322 is a wasteful number, since it uses less digits than its factorization.

21539322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24443 (or 24433 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 21539322 is about 4641.0475110690. The cubic root of 21539322 is about 278.2343055109.

The spelling of 21539322 in words is "twenty-one million, five hundred thirty-nine thousand, three hundred twenty-two".