21850650 has 72 divisors (see below), whose sum is σ = 59772960. Its totient is φ = 5721120.

The previous prime is 21850637. The next prime is 21850679. The reversal of 21850650 is 5605812.

21850650 is a `hidden beast` number, since 2 + 1 + 8 + 5 + 0 + 650 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26139 + ... + 26961.

It is an arithmetic number, because the mean of its divisors is an integer number (830180).

Almost surely, 2^21850650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21850650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29886480).

21850650 is an abundant number, since it is smaller than the sum of its proper divisors (37922310).

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

21850650 is a wasteful number, since it uses less digits than its factorization.

21850650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 21850650 is about 4674.4678841554. The cubic root of 21850650 is about 279.5684252752.

It can be divided in two parts, 21850 and 650, that added together give a square (22500 = 150²).

The spelling of 21850650 in words is "twenty-one million, eight hundred fifty thousand, six hundred fifty".