21210001001121 has 32 divisors (see below), whose sum is σ = 30061383206400. Its totient is φ = 13255881154560.

The previous prime is 21210001001089. The next prime is 21210001001197. The reversal of 21210001001121 is 12110010001212.

It is not a de Polignac number, because 21210001001121 - 2⁵ = 21210001001089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210001001097 and 21210001001106.

It is not an unprimeable number, because it can be changed into a prime (21210001001521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56881075 + ... + 57252743.

It is an arithmetic number, because the mean of its divisors is an integer number (939418225200).

Almost surely, 2^{21210001001121} is an apocalyptic number.

It is an amenable number.

21210001001121 is a deficient number, since it is larger than the sum of its proper divisors (8851382205279).

21210001001121 is a wasteful number, since it uses less digits than its factorization.

21210001001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376089.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210001001121 its reverse (12110010001212), we get a palindrome (33320011002333).

Subtracting from 21210001001121 its reverse (12110010001212), we obtain a palindrome (9099990999909).

The spelling of 21210001001121 in words is "twenty-one trillion, two hundred ten billion, one million, one thousand, one hundred twenty-one".