21125050 has 48 divisors (see below), whose sum is σ = 43088760. Its totient is φ = 7669760.

The previous prime is 21125029. The next prime is 21125057. The reversal of 21125050 is 5052112.

It can be written as a sum of positive squares in 12 ways, for example, as 8071281 + 13053769 = 2841^2 + 3613^2 .

It is not an unprimeable number, because it can be changed into a prime (21125057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24222 + ... + 25078.

Almost surely, 2^21125050 is an apocalyptic number.

21125050 is an abundant number, since it is smaller than the sum of its proper divisors (21963710).

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

21125050 is a wasteful number, since it uses less digits than its factorization.

21125050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 910 counting only the distinct ones).

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

The square root of 21125050 is about 4596.1995169923. The cubic root of 21125050 is about 276.4389587814.

Adding to 21125050 its reverse (5052112), we get a palindrome (26177162).

It can be divided in two parts, 211250 and 50, that multiplied together give a square (10562500 = 3250²).

The spelling of 21125050 in words is "twenty-one million, one hundred twenty-five thousand, fifty".