21354032 has 40 divisors (see below), whose sum is σ = 48571296. Its totient is φ = 8902656.

The previous prime is 21354019. The next prime is 21354049. The reversal of 21354032 is 23045312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21353995 and 21354013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1568 + ... + 6720.

Almost surely, 2^21354032 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 21354032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24285648).

21354032 is an abundant number, since it is smaller than the sum of its proper divisors (27217264).

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

21354032 is a wasteful number, since it uses less digits than its factorization.

21354032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205 (or 5199 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21354032 is about 4621.0423066663. The cubic root of 21354032 is about 277.4341785830.

Adding to 21354032 its reverse (23045312), we get a palindrome (44399344).

It can be divided in two parts, 213 and 54032, that added together give a palindrome (54245).

The spelling of 21354032 in words is "twenty-one million, three hundred fifty-four thousand, thirty-two".