21401650 has 12 divisors (see below), whose sum is σ = 39807162. Its totient is φ = 8560640.

The previous prime is 21401647. The next prime is 21401663. The reversal of 21401650 is 5610412.

It can be written as a sum of positive squares in 3 ways, for example, as 8173881 + 13227769 = 2859^2 + 3637^2 .

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, 213967 + ... + 214066.

Almost surely, 2^21401650 is an apocalyptic number.

21401650 is a deficient number, since it is larger than the sum of its proper divisors (18405512).

21401650 is a wasteful number, since it uses less digits than its factorization.

21401650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428045 (or 428040 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21401650 is about 4626.1917383524. The cubic root of 21401650 is about 277.6402451016.

The spelling of 21401650 in words is "twenty-one million, four hundred one thousand, six hundred fifty".