21027650 has 48 divisors (see below), whose sum is σ = 45366144. Its totient is φ = 7102080.

The previous prime is 21027649. The next prime is 21027673. The reversal of 21027650 is 5672012.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25139 + ... + 25961.

It is an arithmetic number, because the mean of its divisors is an integer number (945128).

Almost surely, 2^21027650 is an apocalyptic number.

21027650 is an abundant number, since it is smaller than the sum of its proper divisors (24338494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21027650 is a wasteful number, since it uses less digits than its factorization.

21027650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21027650 is about 4585.5915648911. The cubic root of 21027650 is about 276.0134506502.

Adding to 21027650 its reverse (5672012), we get a palindrome (26699662).

The spelling of 21027650 in words is "twenty-one million, twenty-seven thousand, six hundred fifty".