21035036 has 12 divisors (see below), whose sum is σ = 40157880. Its totient is φ = 9561360.

The previous prime is 21035029. The next prime is 21035059. The reversal of 21035036 is 63053012.

It is a junction number, because it is equal to n+sod(n) for n = 21034999 and 21035017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238991 + ... + 239078.

It is an arithmetic number, because the mean of its divisors is an integer number (3346490).

Almost surely, 2^21035036 is an apocalyptic number.

It is an amenable number.

21035036 is a deficient number, since it is larger than the sum of its proper divisors (19122844).

21035036 is a wasteful number, since it uses less digits than its factorization.

21035036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478084 (or 478082 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 21035036 is about 4586.3968428386. The cubic root of 21035036 is about 276.0457636080.

Adding to 21035036 its reverse (63053012), we get a palindrome (84088048).

The spelling of 21035036 in words is "twenty-one million, thirty-five thousand, thirty-six".