21838450 has 24 divisors (see below), whose sum is σ = 42022980. Its totient is φ = 8433600.

The previous prime is 21838441. The next prime is 21838451. The reversal of 21838450 is 5483812.

It can be written as a sum of positive squares in 6 ways, for example, as 11269449 + 10569001 = 3357^2 + 3251^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21838451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6081 + ... + 8980.

Almost surely, 2^21838450 is an apocalyptic number.

21838450 is a deficient number, since it is larger than the sum of its proper divisors (20184530).

21838450 is a wasteful number, since it uses less digits than its factorization.

21838450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15102 (or 15097 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21838450 is about 4673.1627405859. The cubic root of 21838450 is about 279.5163845691.

The spelling of 21838450 in words is "twenty-one million, eight hundred thirty-eight thousand, four hundred fifty".