21322120 has 16 divisors (see below), whose sum is σ = 47974860. Its totient is φ = 8528832.

The previous prime is 21322117. The next prime is 21322129. The reversal of 21322120 is 2122312.

It can be written as a sum of positive squares in 2 ways, for example, as 21288996 + 33124 = 4614^2 + 182^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21322120.

It is not an unprimeable number, because it can be changed into a prime (21322129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266487 + ... + 266566.

Almost surely, 2^21322120 is an apocalyptic number.

21322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322120 is an abundant number, since it is smaller than the sum of its proper divisors (26652740).

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

21322120 is a wasteful number, since it uses less digits than its factorization.

21322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533064 (or 533060 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21322120 is about 4617.5881150228. The cubic root of 21322120 is about 277.2959081545.

Adding to 21322120 its reverse (2122312), we get a palindrome (23444432).

The spelling of 21322120 in words is "twenty-one million, three hundred twenty-two thousand, one hundred twenty".