21148516 has 12 divisors (see below), whose sum is σ = 37065532. Its totient is φ = 10558368.

The previous prime is 21148499. The next prime is 21148529. The reversal of 21148516 is 61584112.

It can be written as a sum of positive squares in 2 ways, for example, as 19448100 + 1700416 = 4410^2 + 1304^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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, 675 + ... + 6538.

Almost surely, 2^21148516 is an apocalyptic number.

It is an amenable number.

21148516 is a deficient number, since it is larger than the sum of its proper divisors (15917016).

21148516 is a wasteful number, since it uses less digits than its factorization.

21148516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950 (or 7948 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 21148516 is about 4598.7515697198. The cubic root of 21148516 is about 276.5412783210.

The spelling of 21148516 in words is "twenty-one million, one hundred forty-eight thousand, five hundred sixteen".