21250130 has 16 divisors (see below), whose sum is σ = 41727744. Its totient is φ = 7727280.

The previous prime is 21250129. The next prime is 21250133. The reversal of 21250130 is 3105212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21250133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96482 + ... + 96701.

It is an arithmetic number, because the mean of its divisors is an integer number (2607984).

Almost surely, 2^21250130 is an apocalyptic number.

21250130 is a deficient number, since it is larger than the sum of its proper divisors (20477614).

21250130 is a wasteful number, since it uses less digits than its factorization.

21250130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193201.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21250130 is about 4609.7863291046. The cubic root of 21250130 is about 276.9834776645.

Adding to 21250130 its reverse (3105212), we get a palindrome (24355342).

The spelling of 21250130 in words is "twenty-one million, two hundred fifty thousand, one hundred thirty".