21250124 has 36 divisors (see below), whose sum is σ = 43570800. Its totient is φ = 9041760.

The previous prime is 21250123. The next prime is 21250129. The reversal of 21250124 is 42105212.

21250124 = 77³ + 78³ + ... + 104³.

It is not an unprimeable number, because it can be changed into a prime (21250121) 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 11 ways as a sum of consecutive naturals, for example, 35177 + ... + 35775.

It is an arithmetic number, because the mean of its divisors is an integer number (1210300).

Almost surely, 2^21250124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21250124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21785400).

21250124 is an abundant number, since it is smaller than the sum of its proper divisors (22320676).

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

21250124 is a wasteful number, since it uses less digits than its factorization.

21250124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21250124 is about 4609.7856783152. The cubic root of 21250124 is about 276.9834515956.

Adding to 21250124 its reverse (42105212), we get a palindrome (63355336).

The spelling of 21250124 in words is "twenty-one million, two hundred fifty thousand, one hundred twenty-four".