21023013235 has 32 divisors (see below), whose sum is σ = 28952064000. Its totient is φ = 14355677952.

The previous prime is 21023013157. The next prime is 21023013247. The reversal of 21023013235 is 53231032012.

It is not a de Polignac number, because 21023013235 - 2⁹ = 21023012723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10515766 + ... + 10517764.

It is an arithmetic number, because the mean of its divisors is an integer number (904752000).

Almost surely, 2^21023013235 is an apocalyptic number.

21023013235 is a deficient number, since it is larger than the sum of its proper divisors (7929050765).

21023013235 is a wasteful number, since it uses less digits than its factorization.

21023013235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115.

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

Adding to 21023013235 its reverse (53231032012), we get a palindrome (74254045247).

The spelling of 21023013235 in words is "twenty-one billion, twenty-three million, thirteen thousand, two hundred thirty-five".