21535350 has 24 divisors (see below), whose sum is σ = 53408040. Its totient is φ = 5742720.

The previous prime is 21535309. The next prime is 21535351. The reversal of 21535350 is 5353512.

It is a self number, because there is not a number n which added to its sum of digits gives 21535350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71635 + ... + 71934.

It is an arithmetic number, because the mean of its divisors is an integer number (2225335).

Almost surely, 2^21535350 is an apocalyptic number.

21535350 is an abundant number, since it is smaller than the sum of its proper divisors (31872690).

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

21535350 is a wasteful number, since it uses less digits than its factorization.

21535350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143584 (or 143579 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 21535350 is about 4640.6195707039. The cubic root of 21535350 is about 278.2172016825.

Adding to 21535350 its reverse (5353512), we get a palindrome (26888862).

It can be divided in two parts, 2153 and 5350, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 21535350 in words is "twenty-one million, five hundred thirty-five thousand, three hundred fifty".