21235036 has 6 divisors (see below), whose sum is σ = 37161320. Its totient is φ = 10617516.

The previous prime is 21235021. The next prime is 21235037. The reversal of 21235036 is 63053212.

It is a junction number, because it is equal to n+sod(n) for n = 21234998 and 21235016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654376 + ... + 2654383.

Almost surely, 2^21235036 is an apocalyptic number.

It is an amenable number.

21235036 is a deficient number, since it is larger than the sum of its proper divisors (15926284).

21235036 is a wasteful number, since it uses less digits than its factorization.

21235036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308763 (or 5308761 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21235036 is about 4608.1488691230. The cubic root of 21235036 is about 276.9178815344.

Adding to 21235036 its reverse (63053212), we get a palindrome (84288248).

The spelling of 21235036 in words is "twenty-one million, two hundred thirty-five thousand, thirty-six".