21025835 has 8 divisors (see below), whose sum is σ = 25413360. Its totient is φ = 16699104.

The previous prime is 21025831. The next prime is 21025861. The reversal of 21025835 is 53852012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21025835 - 2² = 21025831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21025831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14432 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (3176670).

Almost surely, 2^21025835 is an apocalyptic number.

21025835 is a deficient number, since it is larger than the sum of its proper divisors (4387525).

21025835 is a wasteful number, since it uses less digits than its factorization.

21025835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30397.

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

The square root of 21025835 is about 4585.3936581279. The cubic root of 21025835 is about 276.0055090618.

Adding to 21025835 its reverse (53852012), we get a palindrome (74877847).

The spelling of 21025835 in words is "twenty-one million, twenty-five thousand, eight hundred thirty-five".