21960396 has 84 divisors (see below), whose sum is σ = 61146792. Its totient is φ = 6873984.

The previous prime is 21960373. The next prime is 21960439. The reversal of 21960396 is 69306912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21960396.

It is an unprimeable number.

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 27 ways as a sum of consecutive naturals, for example, 49351 + ... + 49793.

It is an arithmetic number, because the mean of its divisors is an integer number (727938).

Almost surely, 2^21960396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21960396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30573396).

21960396 is an abundant number, since it is smaller than the sum of its proper divisors (39186396).

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

21960396 is a wasteful number, since it uses less digits than its factorization.

21960396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 21960396 is about 4686.1920575239. The cubic root of 21960396 is about 280.0356927288.

The spelling of 21960396 in words is "twenty-one million, nine hundred sixty thousand, three hundred ninety-six".