21146148 has 36 divisors (see below), whose sum is σ = 53703468. Its totient is φ = 7015680.

The previous prime is 21146137. The next prime is 21146161. The reversal of 21146148 is 84164112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1272384 + 19873764 = 1128^2 + 4458^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7128 + ... + 9648.

It is an arithmetic number, because the mean of its divisors is an integer number (1491763).

Almost surely, 2^21146148 is an apocalyptic number.

It is an amenable number.

21146148 is an abundant number, since it is smaller than the sum of its proper divisors (32557320).

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

21146148 is a wasteful number, since it uses less digits than its factorization.

21146148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764 (or 2759 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21146148 is about 4598.4941013336. The cubic root of 21146148 is about 276.5309564905.

The spelling of 21146148 in words is "twenty-one million, one hundred forty-six thousand, one hundred forty-eight".