21752150 has 48 divisors (see below), whose sum is σ = 48687360. Its totient is φ = 7063200.

The previous prime is 21752141. The next prime is 21752177. The reversal of 21752150 is 5125712.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5015 + ... + 8285.

It is an arithmetic number, because the mean of its divisors is an integer number (1014320).

Almost surely, 2^21752150 is an apocalyptic number.

21752150 is an abundant number, since it is smaller than the sum of its proper divisors (26935210).

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

21752150 is a wasteful number, since it uses less digits than its factorization.

21752150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309 (or 3304 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 21752150 is about 4663.9200250433. The cubic root of 21752150 is about 279.1477059472.

Adding to 21752150 its reverse (5125712), we get a palindrome (26877862).

The spelling of 21752150 in words is "twenty-one million, seven hundred fifty-two thousand, one hundred fifty".