21121210221113 has 4 divisors (see below), whose sum is σ = 21145684393728. Its totient is φ = 21096736048500.

The previous prime is 21121210221071. The next prime is 21121210221121. The reversal of 21121210221113 is 31112201212112.

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 21121210221113 - 2³² = 21116915253817 is a prime.

It is a super-2 number, since 2×21121210221113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121210221913) 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, 12237085013 + ... + 12237086738.

It is an arithmetic number, because the mean of its divisors is an integer number (5286421098432).

Almost surely, 2^{21121210221113} is an apocalyptic number.

It is an amenable number.

21121210221113 is a deficient number, since it is larger than the sum of its proper divisors (24474172615).

21121210221113 is an equidigital number, since it uses as much as digits as its factorization.

21121210221113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24474172614.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21121210221113 its reverse (31112201212112), we get a palindrome (52233411433225).

Subtracting 21121210221113 from its reverse (31112201212112), we obtain a palindrome (9990990990999).

The spelling of 21121210221113 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred thirteen".