21402330021121 has 12 divisors (see below), whose sum is σ = 24896802608532. Its totient is φ = 18344696159328.

The previous prime is 21402330021071. The next prime is 21402330021133. The reversal of 21402330021121 is 12112003320412.

It can be written as a sum of positive squares in 2 ways, for example, as 13566249531121 + 7836080490000 = 3683239^2 + 2799300^2 .

It is not a de Polignac number, because 21402330021121 - 2²¹ = 21402327923969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21402330021092 and 21402330021101.

It is not an unprimeable number, because it can be changed into a prime (21402330121121) 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 11 ways as a sum of consecutive naturals, for example, 4048071 + ... + 7693603.

It is an arithmetic number, because the mean of its divisors is an integer number (2074733550711).

Almost surely, 2^{21402330021121} is an apocalyptic number.

It is an amenable number.

21402330021121 is a deficient number, since it is larger than the sum of its proper divisors (3494472587411).

21402330021121 is a wasteful number, since it uses less digits than its factorization.

21402330021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765360 (or 3765353 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21402330021121 its reverse (12112003320412), we get a palindrome (33514333341533).

The spelling of 21402330021121 in words is "twenty-one trillion, four hundred two billion, three hundred thirty million, twenty-one thousand, one hundred twenty-one".