21250150 has 12 divisors (see below), whose sum is σ = 39525372. Its totient is φ = 8500040.

The previous prime is 21250139. The next prime is 21250171. The reversal of 21250150 is 5105212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212452 + ... + 212551.

It is an arithmetic number, because the mean of its divisors is an integer number (3293781).

Almost surely, 2^21250150 is an apocalyptic number.

21250150 is a deficient number, since it is larger than the sum of its proper divisors (18275222).

21250150 is a wasteful number, since it uses less digits than its factorization.

21250150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425015 (or 425010 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 21250150 is about 4609.7884984021. The cubic root of 21250150 is about 276.9835645607.

Adding to 21250150 its reverse (5105212), we get a palindrome (26355362).

The spelling of 21250150 in words is "twenty-one million, two hundred fifty thousand, one hundred fifty".