21446964 has 96 divisors (see below), whose sum is σ = 69350400. Its totient is φ = 5568480.

The previous prime is 21446963. The next prime is 21446987. The reversal of 21446964 is 46964412.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7027 + ... + 9605.

It is an arithmetic number, because the mean of its divisors is an integer number (722400).

Almost surely, 2^21446964 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 21446964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34675200).

21446964 is an abundant number, since it is smaller than the sum of its proper divisors (47903436).

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

21446964 is a wasteful number, since it uses less digits than its factorization.

21446964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610 (or 2602 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 21446964 is about 4631.0866975258. The cubic root of 21446964 is about 277.8360574369.

It can be divided in two parts, 21 and 446964, that added together give a triangular number (446985 = T₉₄₅).

The spelling of 21446964 in words is "twenty-one million, four hundred forty-six thousand, nine hundred sixty-four".