21433120 has 48 divisors (see below), whose sum is σ = 51194808. Its totient is φ = 8478720.

The previous prime is 21433103. The next prime is 21433123. The reversal of 21433120 is 2133412.

21433120 = T₂₂₉ + T₂₃₀ + ... + T₅₁₉.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16289296 + 5143824 = 4036^2 + 2268^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21433094 and 21433103.

It is not an unprimeable number, because it can be changed into a prime (21433123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14830 + ... + 16210.

Almost surely, 2^21433120 is an apocalyptic number.

21433120 is a gapful number since it is divisible by the number (20) 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 21433120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25597404).

21433120 is an abundant number, since it is smaller than the sum of its proper divisors (29761688).

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

21433120 is a wasteful number, since it uses less digits than its factorization.

21433120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21433120 is about 4629.5917746601. The cubic root of 21433120 is about 277.7762635769.

Adding to 21433120 its reverse (2133412), we get a palindrome (23566532).

The spelling of 21433120 in words is "twenty-one million, four hundred thirty-three thousand, one hundred twenty".