21034025 has 12 divisors (see below), whose sum is σ = 26719644. Its totient is φ = 16416000.

The previous prime is 21034003. The next prime is 21034033. The reversal of 21034025 is 52043012.

It can be written as a sum of positive squares in 6 ways, for example, as 2483776 + 18550249 = 1576^2 + 4307^2 .

It is not a de Polignac number, because 21034025 - 2¹⁴ = 21017641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033994 and 21034012.

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, 9236 + ... + 11285.

It is an arithmetic number, because the mean of its divisors is an integer number (2226637).

Almost surely, 2^21034025 is an apocalyptic number.

21034025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21034025 is a deficient number, since it is larger than the sum of its proper divisors (5685619).

21034025 is a wasteful number, since it uses less digits than its factorization.

21034025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20572 (or 20567 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21034025 is about 4586.2866242746. The cubic root of 21034025 is about 276.0413410383.

Adding to 21034025 its reverse (52043012), we get a palindrome (73077037).

The spelling of 21034025 in words is "twenty-one million, thirty-four thousand, twenty-five".