21362850 has 72 divisors (see below), whose sum is σ = 59410260. Its totient is φ = 5496960.

The previous prime is 21362839. The next prime is 21362851. The reversal of 21362850 is 5826312.

It can be written as a sum of positive squares in 6 ways, for example, as 2518569 + 18844281 = 1587^2 + 4341^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21362851) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12232 + ... + 13868.

Almost surely, 2^21362850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21362850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29705130).

21362850 is an abundant number, since it is smaller than the sum of its proper divisors (38047410).

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

21362850 is a wasteful number, since it uses less digits than its factorization.

21362850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21362850 is about 4621.9963219371. The cubic root of 21362850 is about 277.4723615035.

The spelling of 21362850 in words is "twenty-one million, three hundred sixty-two thousand, eight hundred fifty".