21026135 has 24 divisors (see below), whose sum is σ = 27669600. Its totient is φ = 15330432.

The previous prime is 21026129. The next prime is 21026143. The reversal of 21026135 is 53162012.

It is not a de Polignac number, because 21026135 - 2⁴ = 21026119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125822 + ... + 125988.

It is an arithmetic number, because the mean of its divisors is an integer number (1152900).

Almost surely, 2^21026135 is an apocalyptic number.

21026135 is a deficient number, since it is larger than the sum of its proper divisors (6643465).

21026135 is a wasteful number, since it uses less digits than its factorization.

21026135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21026135 is about 4585.4263705789. The cubic root of 21026135 is about 276.0068217526.

Adding to 21026135 its reverse (53162012), we get a palindrome (74188147).

The spelling of 21026135 in words is "twenty-one million, twenty-six thousand, one hundred thirty-five".