21319896 has 64 divisors (see below), whose sum is σ = 59915520. Its totient is φ = 6272640.

The previous prime is 21319889. The next prime is 21319937. The reversal of 21319896 is 69891312.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5691 + ... + 8661.

It is an arithmetic number, because the mean of its divisors is an integer number (936180).

Almost surely, 2^21319896 is an apocalyptic number.

21319896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21319896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29957760).

21319896 is an abundant number, since it is smaller than the sum of its proper divisors (38595624).

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

21319896 is a wasteful number, since it uses less digits than its factorization.

21319896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016 (or 3012 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 21319896 is about 4617.3472903822. The cubic root of 21319896 is about 277.2862667189.

The spelling of 21319896 in words is "twenty-one million, three hundred nineteen thousand, eight hundred ninety-six".