21850038 has 48 divisors (see below), whose sum is σ = 56958720. Its totient is φ = 5913648.

The previous prime is 21850027. The next prime is 21850039. The reversal of 21850038 is 83005812.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21849993 and 21850020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2170 + ... + 6957.

It is an arithmetic number, because the mean of its divisors is an integer number (1186640).

Almost surely, 2^21850038 is an apocalyptic number.

21850038 is an abundant number, since it is smaller than the sum of its proper divisors (35108682).

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

21850038 is a wasteful number, since it uses less digits than its factorization.

21850038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9161 (or 9158 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21850038 is about 4674.4024217006. The cubic root of 21850038 is about 279.5658151701.

The spelling of 21850038 in words is "twenty-one million, eight hundred fifty thousand, thirty-eight".