21000122110121 has 16 divisors (see below), whose sum is σ = 26275144722048. Its totient is φ = 16305497577600.

The previous prime is 21000122110103. The next prime is 21000122110207. The reversal of 21000122110121 is 12101122100012.

It is not a de Polignac number, because 21000122110121 - 2³⁴ = 20982942240937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000122110096 and 21000122110105.

It is not an unprimeable number, because it can be changed into a prime (21000122115121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485261030 + ... + 485304303.

It is an arithmetic number, because the mean of its divisors is an integer number (1642196545128).

Almost surely, 2^{21000122110121} is an apocalyptic number.

It is an amenable number.

21000122110121 is a deficient number, since it is larger than the sum of its proper divisors (5275022611927).

21000122110121 is a wasteful number, since it uses less digits than its factorization.

21000122110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970565632.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21000122110121 its reverse (12101122100012), we get a palindrome (33101244210133).

The spelling of 21000122110121 in words is "twenty-one trillion, one hundred twenty-two million, one hundred ten thousand, one hundred twenty-one".