21910850 has 36 divisors (see below), whose sum is σ = 44147286. Its totient is φ = 8087040.

The previous prime is 21910843. The next prime is 21910859. The reversal of 21910850 is 5801912.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 167281 + 21743569 = 409^2 + 4663^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21910859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7154 + ... + 9746.

Almost surely, 2^21910850 is an apocalyptic number.

21910850 is an abundant number, since it is smaller than the sum of its proper divisors (22236436).

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

21910850 is a wasteful number, since it uses less digits than its factorization.

21910850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631 (or 2613 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 21910850 is about 4680.9026907211. The cubic root of 21910850 is about 279.8249330812.

The spelling of 21910850 in words is "twenty-one million, nine hundred ten thousand, eight hundred fifty".