21021113223101 has 4 divisors (see below), whose sum is σ = 21083490414012. Its totient is φ = 20958736032192.

The previous prime is 21021113223083. The next prime is 21021113223127. The reversal of 21021113223101 is 10132231112012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4582913319076 + 16438199904025 = 2140774^2 + 4054405^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021113223101 - 2²² = 21021109028797 is a prime.

It is a super-2 number, since 2×21021113223101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021113223161) 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, 31188594950 + ... + 31188595623.

It is an arithmetic number, because the mean of its divisors is an integer number (5270872603503).

Almost surely, 2^{21021113223101} is an apocalyptic number.

It is an amenable number.

21021113223101 is a deficient number, since it is larger than the sum of its proper divisors (62377190911).

21021113223101 is an equidigital number, since it uses as much as digits as its factorization.

21021113223101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62377190910.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21021113223101 its reverse (10132231112012), we get a palindrome (31153344335113).

The spelling of 21021113223101 in words is "twenty-one trillion, twenty-one billion, one hundred thirteen million, two hundred twenty-three thousand, one hundred one".