21383496 has 96 divisors (see below), whose sum is σ = 60652800. Its totient is φ = 6800640.

The previous prime is 21383473. The next prime is 21383497. The reversal of 21383496 is 69438312.

It is a super-3 number, since 3×21383496³ (a number of 23 digits) contains 333 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21383496.

It is not an unprimeable number, because it can be changed into a prime (21383497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240220 + ... + 240308.

It is an arithmetic number, because the mean of its divisors is an integer number (631800).

Almost surely, 2^21383496 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 21383496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30326400).

21383496 is an abundant number, since it is smaller than the sum of its proper divisors (39269304).

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

21383496 is a wasteful number, since it uses less digits than its factorization.

21383496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 212 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 21383496 is about 4624.2292330723. The cubic root of 21383496 is about 277.5617198971.

The spelling of 21383496 in words is "twenty-one million, three hundred eighty-three thousand, four hundred ninety-six".