21463208 has 32 divisors (see below), whose sum is σ = 44271360. Its totient is φ = 9693120.

The previous prime is 21463201. The next prime is 21463223. The reversal of 21463208 is 80236412.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21463201) 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, 2693 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (1383480).

Almost surely, 2^21463208 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 21463208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22135680).

21463208 is an abundant number, since it is smaller than the sum of its proper divisors (22808152).

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

21463208 is a wasteful number, since it uses less digits than its factorization.

21463208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457 (or 4453 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21463208 is about 4632.8401656004. The cubic root of 21463208 is about 277.9061843783.

The spelling of 21463208 in words is "twenty-one million, four hundred sixty-three thousand, two hundred eight".