21433896 has 160 divisors (see below), whose sum is σ = 68302080. Its totient is φ = 6220800.

The previous prime is 21433891. The next prime is 21433897. The reversal of 21433896 is 69833412.

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.

Its product of digits (31104) is a multiple of the sum of its prime divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 21433896.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433891) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 220920 + ... + 221016.

It is an arithmetic number, because the mean of its divisors is an integer number (426888).

It is a vampire number, since it can be written as 3492 ⋅ 6138 (with its own digits).

Almost surely, 2^21433896 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 21433896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34151040).

21433896 is an abundant number, since it is smaller than the sum of its proper divisors (46868184).

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

21433896 is a wasteful number, since it uses less digits than its factorization.

21433896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 144 counting only the distinct ones).

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

The square root of 21433896 is about 4629.6755825868. The cubic root of 21433896 is about 277.7796158930.

The spelling of 21433896 in words is "twenty-one million, four hundred thirty-three thousand, eight hundred ninety-six".