21025914 has 64 divisors (see below), whose sum is σ = 52421376. Its totient is φ = 5474304.

The previous prime is 21025909. The next prime is 21025937. The reversal of 21025914 is 41952012.

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 31 ways as a sum of consecutive naturals, for example, 52764 + ... + 53160.

It is an arithmetic number, because the mean of its divisors is an integer number (819084).

Almost surely, 2^21025914 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21025914, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26210688).

21025914 is an abundant number, since it is smaller than the sum of its proper divisors (31395462).

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

21025914 is a wasteful number, since it uses less digits than its factorization.

21025914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21025914 is about 4585.4022724293. The cubic root of 21025914 is about 276.0058547382.

Adding to 21025914 its reverse (41952012), we get a palindrome (62977926).

The spelling of 21025914 in words is "twenty-one million, twenty-five thousand, nine hundred fourteen".