21035356 has 12 divisors (see below), whose sum is σ = 38749480. Its totient is φ = 9964080.

The previous prime is 21035327. The next prime is 21035359. The reversal of 21035356 is 65353012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21035356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138315 + ... + 138466.

Almost surely, 2^21035356 is an apocalyptic number.

It is an amenable number.

21035356 is a deficient number, since it is larger than the sum of its proper divisors (17714124).

21035356 is a wasteful number, since it uses less digits than its factorization.

21035356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276804 (or 276802 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 21035356 is about 4586.4317284791. The cubic root of 21035356 is about 276.0471634027.

Adding to 21035356 its reverse (65353012), we get a palindrome (86388368).

The spelling of 21035356 in words is "twenty-one million, thirty-five thousand, three hundred fifty-six".