21316148 has 12 divisors (see below), whose sum is σ = 42632352. Its totient is φ = 9135480.

The previous prime is 21316133. The next prime is 21316153. The reversal of 21316148 is 84161312.

21316148 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380618 + ... + 380673.

It is an arithmetic number, because the mean of its divisors is an integer number (3552696).

Almost surely, 2^21316148 is an apocalyptic number.

21316148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21316148 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21316148 is a wasteful number, since it uses less digits than its factorization.

21316148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761302 (or 761300 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 21316148 is about 4616.9414118007. The cubic root of 21316148 is about 277.2700169549.

It can be divided in two parts, 213 and 16148, that added together give a palindrome (16361).

The spelling of 21316148 in words is "twenty-one million, three hundred sixteen thousand, one hundred forty-eight".