21023011134 has 32 divisors (see below), whose sum is σ = 46787300640. Its totient is φ = 6997245696.

The previous prime is 21023011133. The next prime is 21023011159. The reversal of 21023011134 is 43111032012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023011133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252897 + ... + 325580.

It is an arithmetic number, because the mean of its divisors is an integer number (1462103145).

Almost surely, 2^21023011134 is an apocalyptic number.

21023011134 is an abundant number, since it is smaller than the sum of its proper divisors (25764289506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21023011134 is a wasteful number, since it uses less digits than its factorization.

21023011134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579161 (or 579155 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21023011134 its reverse (43111032012), we get a palindrome (64134043146).

The spelling of 21023011134 in words is "twenty-one billion, twenty-three million, eleven thousand, one hundred thirty-four".