21014725 has 6 divisors (see below), whose sum is σ = 26058290. Its totient is φ = 16811760.

The previous prime is 21014713. The next prime is 21014743. The reversal of 21014725 is 52741012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6315169 + 14699556 = 2513^2 + 3834^2 .

It is not a de Polignac number, because 21014725 - 2⁷ = 21014597 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21014696 and 21014705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420270 + ... + 420319.

Almost surely, 2^21014725 is an apocalyptic number.

21014725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21014725 is a deficient number, since it is larger than the sum of its proper divisors (5043565).

21014725 is an equidigital number, since it uses as much as digits as its factorization.

21014725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840599 (or 840594 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21014725 is about 4584.1820426331. The cubic root of 21014725 is about 275.9568869506.

Adding to 21014725 its reverse (52741012), we get a palindrome (73755737).

The spelling of 21014725 in words is "twenty-one million, fourteen thousand, seven hundred twenty-five".