21840150 has 24 divisors (see below), whose sum is σ = 54163944. Its totient is φ = 5824000.

The previous prime is 21840149. The next prime is 21840157. The reversal of 21840150 is 5104812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72651 + ... + 72950.

It is an arithmetic number, because the mean of its divisors is an integer number (2256831).

Almost surely, 2^21840150 is an apocalyptic number.

21840150 is an abundant number, since it is smaller than the sum of its proper divisors (32323794).

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

21840150 is a wasteful number, since it uses less digits than its factorization.

21840150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145616 (or 145611 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21840150 is about 4673.3446267101. The cubic root of 21840150 is about 279.5236373049.

Adding to 21840150 its reverse (5104812), we get a palindrome (26944962).

The spelling of 21840150 in words is "twenty-one million, eight hundred forty thousand, one hundred fifty".