21464436 has 96 divisors (see below), whose sum is σ = 59996160. Its totient is φ = 5846400.

The previous prime is 21464423. The next prime is 21464447. The reversal of 21464436 is 63446412.

21464436 = T₈ + T₉ + ... + T₅₀₄.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302281 + ... + 302351.

It is an arithmetic number, because the mean of its divisors is an integer number (624960).

Almost surely, 2^21464436 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 21464436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29998080).

21464436 is an abundant number, since it is smaller than the sum of its proper divisors (38531724).

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

21464436 is a wasteful number, since it uses less digits than its factorization.

21464436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 203 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

The square root of 21464436 is about 4632.9726957969. The cubic root of 21464436 is about 277.9114843361.

The spelling of 21464436 in words is "twenty-one million, four hundred sixty-four thousand, four hundred thirty-six".