21463452 has 54 divisors (see below), whose sum is σ = 57661968. Its totient is φ = 6730368.

The previous prime is 21463447. The next prime is 21463489. The reversal of 21463452 is 25436412.

21463452 is a `hidden beast` number, since 21 + 4 + 634 + 5 + 2 = 666.

It is a super-3 number, since 3×21463452³ (a number of 23 digits) contains 333 as substring.

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 17 ways as a sum of consecutive naturals, for example, 9373 + ... + 11435.

Almost surely, 2^21463452 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 21463452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28830984).

21463452 is an abundant number, since it is smaller than the sum of its proper divisors (36198516).

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

21463452 is a wasteful number, since it uses less digits than its factorization.

21463452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107 (or 2085 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21463452 is about 4632.8664992637. The cubic root of 21463452 is about 277.9072374805.

Adding to 21463452 its reverse (25436412), we get a palindrome (46899864).

The spelling of 21463452 in words is "twenty-one million, four hundred sixty-three thousand, four hundred fifty-two".