21010036 has 24 divisors (see below), whose sum is σ = 38586240. Its totient is φ = 9996000.

The previous prime is 21010013. The next prime is 21010037. The reversal of 21010036 is 63001012.

It is a super-2 number, since 2×21010036² = 882843225442592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21009998 and 21010025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010037) 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, 6961 + ... + 9511.

It is an arithmetic number, because the mean of its divisors is an integer number (1607760).

Almost surely, 2^21010036 is an apocalyptic number.

It is an amenable number.

21010036 is a deficient number, since it is larger than the sum of its proper divisors (17576204).

21010036 is a wasteful number, since it uses less digits than its factorization.

21010036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 2653 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21010036 is about 4583.6705815318. The cubic root of 21010036 is about 275.9363607387.

Adding to 21010036 its reverse (63001012), we get a palindrome (84011048).

The spelling of 21010036 in words is "twenty-one million, ten thousand, thirty-six".