21021148 has 12 divisors (see below), whose sum is σ = 36900472. Its totient is φ = 10478160.

The previous prime is 21021127. The next prime is 21021157. The reversal of 21021148 is 84112012.

It is a happy 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, 6615 + ... + 9262.

Almost surely, 2^21021148 is an apocalyptic number.

It is an amenable number.

21021148 is a deficient number, since it is larger than the sum of its proper divisors (15879324).

21021148 is a wasteful number, since it uses less digits than its factorization.

21021148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16212 (or 16210 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21021148 is about 4584.8825502950. The cubic root of 21021148 is about 275.9849988346.

The spelling of 21021148 in words is "twenty-one million, twenty-one thousand, one hundred forty-eight".