21148612 has 12 divisors (see below), whose sum is σ = 39187260. Its totient is φ = 9952256.

The previous prime is 21148601. The next prime is 21148667. The reversal of 21148612 is 21684112.

It can be written as a sum of positive squares in 2 ways, for example, as 12292036 + 8856576 = 3506^2 + 2976^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 155437 + ... + 155572.

It is an arithmetic number, because the mean of its divisors is an integer number (3265605).

Almost surely, 2^21148612 is an apocalyptic number.

It is an amenable number.

21148612 is a deficient number, since it is larger than the sum of its proper divisors (18038648).

21148612 is a wasteful number, since it uses less digits than its factorization.

21148612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311030 (or 311028 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 21148612 is about 4598.7620073233. The cubic root of 21148612 is about 276.5416967573.

The spelling of 21148612 in words is "twenty-one million, one hundred forty-eight thousand, six hundred twelve".