21020132113021 has 4 divisors (see below), whose sum is σ = 21032504176000. Its totient is φ = 21007760050044.

The previous prime is 21020132112943. The next prime is 21020132113051. The reversal of 21020132113021 is 12031123102012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21020132113021 - 2⁹ = 21020132112509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020132113021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020132113051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6186028941 + ... + 6186032338.

It is an arithmetic number, because the mean of its divisors is an integer number (5258126044000).

Almost surely, 2^{21020132113021} is an apocalyptic number.

It is an amenable number.

21020132113021 is a deficient number, since it is larger than the sum of its proper divisors (12372062979).

21020132113021 is a wasteful number, since it uses less digits than its factorization.

21020132113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12372062978.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21020132113021 its reverse (12031123102012), we get a palindrome (33051255215033).

The spelling of 21020132113021 in words is "twenty-one trillion, twenty billion, one hundred thirty-two million, one hundred thirteen thousand, twenty-one".