21959336 has 16 divisors (see below), whose sum is σ = 47055840. Its totient is φ = 9411120.

The previous prime is 21959323. The next prime is 21959339. The reversal of 21959336 is 63395912.

It is a self number, because there is not a number n which added to its sum of digits gives 21959336.

It is not an unprimeable number, because it can be changed into a prime (21959339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196010 + ... + 196121.

It is an arithmetic number, because the mean of its divisors is an integer number (2940990).

Almost surely, 2^21959336 is an apocalyptic number.

It is an amenable number.

21959336 is an abundant number, since it is smaller than the sum of its proper divisors (25096504).

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

21959336 is a wasteful number, since it uses less digits than its factorization.

21959336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392144 (or 392140 counting only the distinct ones).

The product of its digits is 43740, while the sum is 38.

The square root of 21959336 is about 4686.0789579349. The cubic root of 21959336 is about 280.0311870024.

The spelling of 21959336 in words is "twenty-one million, nine hundred fifty-nine thousand, three hundred thirty-six".