21423150 has 96 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 4894560.

The previous prime is 21423119. The next prime is 21423161. The reversal of 21423150 is 5132412.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8317 + ... + 10583.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^21423150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

21423150 is an abundant number, since it is smaller than the sum of its proper divisors (46072530).

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

21423150 is a wasteful number, since it uses less digits than its factorization.

21423150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295 (or 2284 counting only the distinct ones).

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

The square root of 21423150 is about 4628.5148806070. The cubic root of 21423150 is about 277.7331860272.

Adding to 21423150 its reverse (5132412), we get a palindrome (26555562).

The spelling of 21423150 in words is "twenty-one million, four hundred twenty-three thousand, one hundred fifty".