21150234 has 48 divisors (see below), whose sum is σ = 54320448. Its totient is φ = 6041952.

The previous prime is 21150229. The next prime is 21150247. The reversal of 21150234 is 43205112.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 294 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (1131676).

Almost surely, 2^21150234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21150234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27160224).

21150234 is an abundant number, since it is smaller than the sum of its proper divisors (33170214).

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

21150234 is an equidigital number, since it uses as much as digits as its factorization.

21150234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6241 (or 6229 counting only the distinct ones).

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

The square root of 21150234 is about 4598.9383557512. The cubic root of 21150234 is about 276.5487663965.

Adding to 21150234 its reverse (43205112), we get a palindrome (64355346).

The spelling of 21150234 in words is "twenty-one million, one hundred fifty thousand, two hundred thirty-four".