21120211002121 has 24 divisors (see below), whose sum is σ = 27067265838720. Its totient is φ = 16294363596000.

The previous prime is 21120211002113. The next prime is 21120211002151. The reversal of 21120211002121 is 12120011202112.

It is not a de Polignac number, because 21120211002121 - 2³ = 21120211002113 is a prime.

It is a super-2 number, since 2×21120211002121² (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 = 21120211002095 and 21120211002104.

It is not an unprimeable number, because it can be changed into a prime (21120211002151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193926081 + ... + 194034958.

It is an arithmetic number, because the mean of its divisors is an integer number (1127802743280).

Almost surely, 2^{21120211002121} is an apocalyptic number.

It is an amenable number.

21120211002121 is a deficient number, since it is larger than the sum of its proper divisors (5947054836599).

21120211002121 is a wasteful number, since it uses less digits than its factorization.

21120211002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387961165 (or 387961158 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21120211002121 its reverse (12120011202112), we get a palindrome (33240222204233).

The spelling of 21120211002121 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two thousand, one hundred twenty-one".