21033025 has 12 divisors (see below), whose sum is σ = 28087612. Its totient is φ = 15531840.

The previous prime is 21033011. The next prime is 21033053. The reversal of 21033025 is 52033012.

21033025 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 6 ways, for example, as 4190209 + 16842816 = 2047^2 + 4104^2 .

It is not a de Polignac number, because 21033025 - 2⁵ = 21032993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32034 + ... + 32683.

Almost surely, 2^21033025 is an apocalyptic number.

21033025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21033025 is a deficient number, since it is larger than the sum of its proper divisors (7054587).

21033025 is a wasteful number, since it uses less digits than its factorization.

21033025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64740 (or 64735 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21033025 is about 4586.1776023176. The cubic root of 21033025 is about 276.0369664482.

Adding to 21033025 its reverse (52033012), we get a palindrome (73066037).

The spelling of 21033025 in words is "twenty-one million, thirty-three thousand, twenty-five".