21649148 has 24 divisors (see below), whose sum is σ = 39224304. Its totient is φ = 10448000.

The previous prime is 21649123. The next prime is 21649153. The reversal of 21649148 is 84194612.

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 7 ways as a sum of consecutive naturals, for example, 15911 + ... + 17217.

It is an arithmetic number, because the mean of its divisors is an integer number (1634346).

Almost surely, 2^21649148 is an apocalyptic number.

It is an amenable number.

21649148 is a deficient number, since it is larger than the sum of its proper divisors (17575156).

21649148 is a wasteful number, since it uses less digits than its factorization.

21649148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453 (or 1451 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21649148 is about 4652.8644940509. The cubic root of 21649148 is about 278.7063966867.

The spelling of 21649148 in words is "twenty-one million, six hundred forty-nine thousand, one hundred forty-eight".