21035725 has 12 divisors (see below), whose sum is σ = 26416960. Its totient is φ = 16614000.

The previous prime is 21035699. The next prime is 21035737. The reversal of 21035725 is 52753012.

It is not a de Polignac number, because 21035725 - 2¹⁵ = 21002957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 21035725.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3351 + ... + 7300.

Almost surely, 2^21035725 is an apocalyptic number.

21035725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21035725 is a deficient number, since it is larger than the sum of its proper divisors (5381235).

21035725 is a wasteful number, since it uses less digits than its factorization.

21035725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10740 (or 10735 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21035725 is about 4586.4719556539. The cubic root of 21035725 is about 276.0487775234.

Adding to 21035725 its reverse (52753012), we get a palindrome (73788737).

The spelling of 21035725 in words is "twenty-one million, thirty-five thousand, seven hundred twenty-five".