21234150 has 180 divisors, whose sum is σ = 69273468. Its totient is φ = 4808160.

The previous prime is 21234137. The next prime is 21234151. The reversal of 21234150 is 5143212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234151) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 198397 + ... + 198503.

Almost surely, 2^21234150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21234150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34636734).

21234150 is an abundant number, since it is smaller than the sum of its proper divisors (48039318).

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

21234150 is a wasteful number, since it uses less digits than its factorization.

21234150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21234150 is about 4608.0527340733. The cubic root of 21234150 is about 276.9140301532.

Adding to 21234150 its reverse (5143212), we get a palindrome (26377362).

The spelling of 21234150 in words is "twenty-one million, two hundred thirty-four thousand, one hundred fifty".