21021103111013 has 4 divisors (see below), whose sum is σ = 21317174985888. Its totient is φ = 20725031236140.

The previous prime is 21021103110979. The next prime is 21021103111037. The reversal of 21021103111013 is 31011130112012.

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 21021103111013 - 2⁶ = 21021103110949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021103110982 and 21021103111000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021103111093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148035937331 + ... + 148035937472.

It is an arithmetic number, because the mean of its divisors is an integer number (5329293746472).

Almost surely, 2^{21021103111013} is an apocalyptic number.

It is an amenable number.

21021103111013 is a deficient number, since it is larger than the sum of its proper divisors (296071874875).

21021103111013 is an equidigital number, since it uses as much as digits as its factorization.

21021103111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296071874874.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21021103111013 its reverse (31011130112012), we get a palindrome (52032233223025).

The spelling of 21021103111013 in words is "twenty-one trillion, twenty-one billion, one hundred three million, one hundred eleven thousand, thirteen".