21424050 has 36 divisors (see below), whose sum is σ = 57560490. Its totient is φ = 5712960.

The previous prime is 21424049. The next prime is 21424061. The reversal of 21424050 is 5042412.

It can be written as a sum of positive squares in 3 ways, for example, as 16184529 + 5239521 = 4023^2 + 2289^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23355 + ... + 24254.

Almost surely, 2^21424050 is an apocalyptic number.

21424050 is an abundant number, since it is smaller than the sum of its proper divisors (36136440).

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

21424050 is a wasteful number, since it uses less digits than its factorization.

21424050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47627 (or 47619 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 21424050 is about 4628.6121029959. The cubic root of 21424050 is about 277.7370752214.

Adding to 21424050 its reverse (5042412), we get a palindrome (26466462).

The spelling of 21424050 in words is "twenty-one million, four hundred twenty-four thousand, fifty".