21035683 has 6 divisors (see below), whose sum is σ = 21401804. Its totient is φ = 20675724.

The previous prime is 21035633. The next prime is 21035687. The reversal of 21035683 is 38653012.

It is a de Polignac number, because none of the positive numbers 2^k-21035683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 460 + ... + 6502.

Almost surely, 2^21035683 is an apocalyptic number.

21035683 is a deficient number, since it is larger than the sum of its proper divisors (366121).

21035683 is an frugal number, since it uses more digits than its factorization.

21035683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161 (or 6102 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21035683 is about 4586.4673769689. The cubic root of 21035683 is about 276.0485938033.

Adding to 21035683 its reverse (38653012), we get a palindrome (59688695).

The spelling of 21035683 in words is "twenty-one million, thirty-five thousand, six hundred eighty-three".