21350024 has 16 divisors (see below), whose sum is σ = 40113420. Its totient is φ = 10653120.

The previous prime is 21350009. The next prime is 21350027. The reversal of 21350024 is 42005312.

It can be written as a sum of positive squares in 2 ways, for example, as 20884900 + 465124 = 4570^2 + 682^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21349984 and 21350011.

It is not an unprimeable number, because it can be changed into a prime (21350027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1862 + ... + 6794.

Almost surely, 2^21350024 is an apocalyptic number.

It is an amenable number.

21350024 is a deficient number, since it is larger than the sum of its proper divisors (18763396).

21350024 is a wasteful number, since it uses less digits than its factorization.

21350024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5480 (or 5476 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21350024 is about 4620.6086179204. The cubic root of 21350024 is about 277.4168200225.

Adding to 21350024 its reverse (42005312), we get a palindrome (63355336).

The spelling of 21350024 in words is "twenty-one million, three hundred fifty thousand, twenty-four".