21545150 has 48 divisors (see below), whose sum is σ = 44782848. Its totient is φ = 7644000.

The previous prime is 21545149. The next prime is 21545179. The reversal of 21545150 is 5154512.

It is a happy number.

It is a Curzon number.

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, 23195 + ... + 24105.

It is an arithmetic number, because the mean of its divisors is an integer number (932976).

Almost surely, 2^21545150 is an apocalyptic number.

21545150 is an abundant number, since it is smaller than the sum of its proper divisors (23237698).

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

21545150 is a wasteful number, since it uses less digits than its factorization.

21545150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 21545150 is about 4641.6753440972. The cubic root of 21545150 is about 278.2593976548.

Adding to 21545150 its reverse (5154512), we get a palindrome (26699662).

The spelling of 21545150 in words is "twenty-one million, five hundred forty-five thousand, one hundred fifty".