21025014 has 8 divisors (see below), whose sum is σ = 42050040. Its totient is φ = 7008336.

The previous prime is 21024961. The next prime is 21025019. The reversal of 21025014 is 41052012.

It is a sphenic number, since it is the product of 3 distinct primes.

21025014 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21024984 and 21025002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1752079 + ... + 1752090.

It is an arithmetic number, because the mean of its divisors is an integer number (5256255).

Almost surely, 2^21025014 is an apocalyptic number.

21025014 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21025014 is a wasteful number, since it uses less digits than its factorization.

21025014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504174.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21025014 is about 4585.3041338607. The cubic root of 21025014 is about 276.0019166008.

Adding to 21025014 its reverse (41052012), we get a palindrome (62077026).

The spelling of 21025014 in words is "twenty-one million, twenty-five thousand, fourteen".