21498650 has 12 divisors (see below), whose sum is σ = 39987582. Its totient is φ = 8599440.

The previous prime is 21498649. The next prime is 21498679. The reversal of 21498650 is 5689412.

It can be written as a sum of positive squares in 3 ways, for example, as 16785409 + 4713241 = 4097^2 + 2171^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21498650.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214937 + ... + 215036.

Almost surely, 2^21498650 is an apocalyptic number.

21498650 is a deficient number, since it is larger than the sum of its proper divisors (18488932).

21498650 is a wasteful number, since it uses less digits than its factorization.

21498650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429985 (or 429980 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21498650 is about 4636.6636712188. The cubic root of 21498650 is about 278.0590682415.

The spelling of 21498650 in words is "twenty-one million, four hundred ninety-eight thousand, six hundred fifty".