21850430 has 32 divisors (see below), whose sum is σ = 45149184. Its totient is φ = 7458336.

The previous prime is 21850429. The next prime is 21850453. The reversal of 21850430 is 3405812.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21850396 and 21850405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19259 + ... + 20361.

It is an arithmetic number, because the mean of its divisors is an integer number (1410912).

Almost surely, 2^21850430 is an apocalyptic number.

21850430 is an abundant number, since it is smaller than the sum of its proper divisors (23298754).

21850430 is a wasteful number, since it uses less digits than its factorization.

21850430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21850430 is about 4674.4443520059. Note that the first 3 decimals coincide. The cubic root of 21850430 is about 279.5674870077.

The spelling of 21850430 in words is "twenty-one million, eight hundred fifty thousand, four hundred thirty".