21120696 has 64 divisors (see below), whose sum is σ = 59047200. Its totient is φ = 6994944.

The previous prime is 21120691. The next prime is 21120707. The reversal of 21120696 is 69602112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59656 + ... + 60008.

Almost surely, 2^21120696 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 21120696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29523600).

21120696 is an abundant number, since it is smaller than the sum of its proper divisors (37926504).

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

21120696 is a wasteful number, since it uses less digits than its factorization.

21120696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21120696 is about 4595.7258403869. The cubic root of 21120696 is about 276.4199655652.

The spelling of 21120696 in words is "twenty-one million, one hundred twenty thousand, six hundred ninety-six".