21464244 has 48 divisors (see below), whose sum is σ = 58074240. Its totient is φ = 6842880.

The previous prime is 21464239. The next prime is 21464249. The reversal of 21464244 is 44246412.

It is a happy number.

21464244 is a `hidden beast` number, since 2 + 14 + 642 + 4 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21464239) and next prime (21464249).

It is a Harshad number since it is a multiple of its sum of digits (27).

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 (21464249) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1837 + ... + 6804.

It is an arithmetic number, because the mean of its divisors is an integer number (1209880).

Almost surely, 2^21464244 is an apocalyptic number.

It is an amenable number.

21464244 is an abundant number, since it is smaller than the sum of its proper divisors (36609996).

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

21464244 is a wasteful number, since it uses less digits than its factorization.

21464244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8677 (or 8669 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 21464244 is about 4632.9519747133. The cubic root of 21464244 is about 277.9106556915.

The spelling of 21464244 in words is "twenty-one million, four hundred sixty-four thousand, two hundred forty-four".