21535150 has 48 divisors (see below), whose sum is σ = 49309344. Its totient is φ = 6814080.

The previous prime is 21535123. The next prime is 21535169. The reversal of 21535150 is 5153512.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2184 + ... + 6916.

It is an arithmetic number, because the mean of its divisors is an integer number (1027278).

Almost surely, 2^21535150 is an apocalyptic number.

21535150 is an abundant number, since it is smaller than the sum of its proper divisors (27774194).

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

21535150 is a wasteful number, since it uses less digits than its factorization.

21535150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4760 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 21535150 is about 4640.5980218071. The cubic root of 21535150 is about 278.2163404069.

Adding to 21535150 its reverse (5153512), we get a palindrome (26688662).

The spelling of 21535150 in words is "twenty-one million, five hundred thirty-five thousand, one hundred fifty".