21313112220121 has 8 divisors (see below), whose sum is σ = 21532931061320. Its totient is φ = 21093295339008.

The previous prime is 21313112220119. The next prime is 21313112220137. The reversal of 21313112220121 is 12102221131312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6580066346896 + 14733045873225 = 2565164^2 + 3838365^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21313112220121 - 2¹ = 21313112220119 is a prime.

It is a super-2 number, since 2×21313112220121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313112220092 and 21313112220101.

It is not an unprimeable number, because it can be changed into a prime (21313112220221) 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 7 ways as a sum of consecutive naturals, for example, 33373435 + ... + 34006063.

It is an arithmetic number, because the mean of its divisors is an integer number (2691616382665).

Almost surely, 2^{21313112220121} is an apocalyptic number.

It is an amenable number.

21313112220121 is a deficient number, since it is larger than the sum of its proper divisors (219818841199).

21313112220121 is an equidigital number, since it uses as much as digits as its factorization.

21313112220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980043.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21313112220121 its reverse (12102221131312), we get a palindrome (33415333351433).

The spelling of 21313112220121 in words is "twenty-one trillion, three hundred thirteen billion, one hundred twelve million, two hundred twenty thousand, one hundred twenty-one".