21849650 has 12 divisors (see below), whose sum is σ = 40640442. Its totient is φ = 8739840.

The previous prime is 21849643. The next prime is 21849671. The reversal of 21849650 is 5694812.

It can be written as a sum of positive squares in 3 ways, for example, as 9815689 + 12033961 = 3133^2 + 3469^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21849650.

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, 218447 + ... + 218546.

Almost surely, 2^21849650 is an apocalyptic number.

21849650 is a deficient number, since it is larger than the sum of its proper divisors (18790792).

21849650 is a wasteful number, since it uses less digits than its factorization.

21849650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437005 (or 437000 counting only the distinct ones).

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

The square root of 21849650 is about 4674.3609188851. The cubic root of 21849650 is about 279.5641603724.

The spelling of 21849650 in words is "twenty-one million, eight hundred forty-nine thousand, six hundred fifty".