21025950 has 48 divisors (see below), whose sum is σ = 56889216. Its totient is φ = 5096800.

The previous prime is 21025937. The next prime is 21025981. The reversal of 21025950 is 5952012.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21025950.

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, 4722 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (1185192).

Almost surely, 2^21025950 is an apocalyptic number.

21025950 is an abundant number, since it is smaller than the sum of its proper divisors (35863266).

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

21025950 is a wasteful number, since it uses less digits than its factorization.

21025950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12769 (or 12764 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 21025950 is about 4585.4061979284. The cubic root of 21025950 is about 276.0060122614.

Adding to 21025950 its reverse (5952012), we get a palindrome (26977962).

The spelling of 21025950 in words is "twenty-one million, twenty-five thousand, nine hundred fifty".