21348144 has 40 divisors (see below), whose sum is σ = 61278320. Its totient is φ = 7115904.

The previous prime is 21348133. The next prime is 21348161. The reversal of 21348144 is 44184312.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24277 + ... + 25140.

It is an arithmetic number, because the mean of its divisors is an integer number (1531958).

Almost surely, 2^21348144 is an apocalyptic number.

21348144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21348144 is an abundant number, since it is smaller than the sum of its proper divisors (39930176).

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

21348144 is a wasteful number, since it uses less digits than its factorization.

21348144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49434 (or 49422 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 21348144 is about 4620.4051770380. The cubic root of 21348144 is about 277.4086770351.

The spelling of 21348144 in words is "twenty-one million, three hundred forty-eight thousand, one hundred forty-four".