21534230 has 16 divisors (see below), whose sum is σ = 38857104. Its totient is φ = 8592480.

The previous prime is 21534221. The next prime is 21534241. The reversal of 21534230 is 3243512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000 + ... + 6860.

It is an arithmetic number, because the mean of its divisors is an integer number (2428569).

Almost surely, 2^21534230 is an apocalyptic number.

21534230 is a deficient number, since it is larger than the sum of its proper divisors (17322874).

21534230 is a wasteful number, since it uses less digits than its factorization.

21534230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21534230 is about 4640.4988955930. The cubic root of 21534230 is about 278.2123784706.

Adding to 21534230 its reverse (3243512), we get a palindrome (24777742).

The spelling of 21534230 in words is "twenty-one million, five hundred thirty-four thousand, two hundred thirty".