21149116 has 6 divisors (see below), whose sum is σ = 37010960. Its totient is φ = 10574556.

The previous prime is 21149083. The next prime is 21149129. The reversal of 21149116 is 61194112.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2643636 + ... + 2643643.

Almost surely, 2^21149116 is an apocalyptic number.

It is an amenable number.

21149116 is a deficient number, since it is larger than the sum of its proper divisors (15861844).

21149116 is a wasteful number, since it uses less digits than its factorization.

21149116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287283 (or 5287281 counting only the distinct ones).

The product of its digits is 432, while the sum is 25.

The square root of 21149116 is about 4598.8168043531. The cubic root of 21149116 is about 276.5438935273.

The spelling of 21149116 in words is "twenty-one million, one hundred forty-nine thousand, one hundred sixteen".