21649276 has 12 divisors (see below), whose sum is σ = 41330520. Its totient is φ = 9840560.

The previous prime is 21649273. The next prime is 21649289. The reversal of 21649276 is 67294612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21649273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245971 + ... + 246058.

It is an arithmetic number, because the mean of its divisors is an integer number (3444210).

Almost surely, 2^21649276 is an apocalyptic number.

It is an amenable number.

21649276 is a deficient number, since it is larger than the sum of its proper divisors (19681244).

21649276 is a wasteful number, since it uses less digits than its factorization.

21649276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492044 (or 492042 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 21649276 is about 4652.8782489981. The cubic root of 21649276 is about 278.7069459670.

The spelling of 21649276 in words is "twenty-one million, six hundred forty-nine thousand, two hundred seventy-six".