21135010 has 16 divisors (see below), whose sum is σ = 40969656. Its totient is φ = 7803648.

The previous prime is 21135001. The next prime is 21135013. The reversal of 21135010 is 1053112.

It can be written as a sum of positive squares in 4 ways, for example, as 7834401 + 13300609 = 2799^2 + 3647^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21135013) 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, 81159 + ... + 81418.

Almost surely, 2^21135010 is an apocalyptic number.

21135010 is a deficient number, since it is larger than the sum of its proper divisors (19834646).

21135010 is a wasteful number, since it uses less digits than its factorization.

21135010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162597.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 21135010 is about 4597.2828931881. The cubic root of 21135010 is about 276.4823969339.

Adding to 21135010 its reverse (1053112), we get a palindrome (22188122).

The spelling of 21135010 in words is "twenty-one million, one hundred thirty-five thousand, ten".