21035825 has 12 divisors (see below), whose sum is σ = 26926848. Its totient is φ = 16285200.

The previous prime is 21035797. The next prime is 21035867. The reversal of 21035825 is 52853012.

It is not a de Polignac number, because 21035825 - 2⁶ = 21035761 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21035794 and 21035803.

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, 12797 + ... + 14346.

It is an arithmetic number, because the mean of its divisors is an integer number (2243904).

Almost surely, 2^21035825 is an apocalyptic number.

21035825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21035825 is a deficient number, since it is larger than the sum of its proper divisors (5891023).

21035825 is a wasteful number, since it uses less digits than its factorization.

21035825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27184 (or 27179 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 21035825 is about 4586.4828572666. The cubic root of 21035825 is about 276.0492149512.

Adding to 21035825 its reverse (52853012), we get a palindrome (73888837).

The spelling of 21035825 in words is "twenty-one million, thirty-five thousand, eight hundred twenty-five".