21828996 has 108 divisors (see below), whose sum is σ = 65945152. Its totient is φ = 5963328.

The previous prime is 21828973. The next prime is 21829091. The reversal of 21828996 is 69982812.

Its product of digits (124416) is a multiple of the sum of its prime divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 211881 + ... + 211983.

Almost surely, 2^21828996 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 21828996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32972576).

21828996 is an abundant number, since it is smaller than the sum of its proper divisors (44116156).

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

21828996 is a wasteful number, since it uses less digits than its factorization.

21828996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 144 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 21828996 is about 4672.1511105699. The cubic root of 21828996 is about 279.4760439570.

The spelling of 21828996 in words is "twenty-one million, eight hundred twenty-eight thousand, nine hundred ninety-six".