21416650 has 24 divisors (see below), whose sum is σ = 39958380. Its totient is φ = 8540160.

The previous prime is 21416641. The next prime is 21416669. The reversal of 21416650 is 5661412.

It can be written as a sum of positive squares in 6 ways, for example, as 2468041 + 18948609 = 1571^2 + 4353^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27466 + ... + 28234.

Almost surely, 2^21416650 is an apocalyptic number.

21416650 is a deficient number, since it is larger than the sum of its proper divisors (18541730).

21416650 is a wasteful number, since it uses less digits than its factorization.

21416650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21416650 is about 4627.8126582652. The cubic root of 21416650 is about 277.7050941684.

The spelling of 21416650 in words is "twenty-one million, four hundred sixteen thousand, six hundred fifty".