21850436 has 12 divisors (see below), whose sum is σ = 38277120. Its totient is φ = 10914120.

The previous prime is 21850429. The next prime is 21850453. The reversal of 21850436 is 63405812.

It is a junction number, because it is equal to n+sod(n) for n = 21850399 and 21850408.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2981 + ... + 7251.

It is an arithmetic number, because the mean of its divisors is an integer number (3189760).

Almost surely, 2^21850436 is an apocalyptic number.

It is an amenable number.

21850436 is a deficient number, since it is larger than the sum of its proper divisors (16426684).

21850436 is a wasteful number, since it uses less digits than its factorization.

21850436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554 (or 5552 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21850436 is about 4674.4449937934. Note that the first 3 decimals coincide. The cubic root of 21850436 is about 279.5675125969.

The spelling of 21850436 in words is "twenty-one million, eight hundred fifty thousand, four hundred thirty-six".