21534150 has 96 divisors (see below), whose sum is σ = 60281856. Its totient is φ = 5040000.

The previous prime is 21534089. The next prime is 21534151. The reversal of 21534150 is 5143512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50940 + ... + 51360.

It is an arithmetic number, because the mean of its divisors is an integer number (627936).

Almost surely, 2^21534150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21534150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30140928).

21534150 is an abundant number, since it is smaller than the sum of its proper divisors (38747706).

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

21534150 is a wasteful number, since it uses less digits than its factorization.

21534150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21534150 is about 4640.4902758222. The cubic root of 21534150 is about 278.2120339491.

Adding to 21534150 its reverse (5143512), we get a palindrome (26677662).

The spelling of 21534150 in words is "twenty-one million, five hundred thirty-four thousand, one hundred fifty".