12210120212121 has 40 divisors (see below), whose sum is σ = 19643279067720. Its totient is φ = 7513764208128.

The previous prime is 12210120212107. The next prime is 12210120212131. The reversal of 12210120212121 is 12121202101221.

12210120212121 is a `hidden beast` number, since 1 + 2 + 210 + 120 + 212 + 121 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 52422681600 + 12157697530521 = 228960^2 + 3486789^2 .

It is not a de Polignac number, because 12210120212121 - 2¹¹ = 12210120210073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210120212094 and 12210120212103.

It is not an unprimeable number, because it can be changed into a prime (12210120212131) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70098625 + ... + 70272593.

It is an arithmetic number, because the mean of its divisors is an integer number (491081976693).

Almost surely, 2^{12210120212121} is an apocalyptic number.

It is an amenable number.

12210120212121 is a deficient number, since it is larger than the sum of its proper divisors (7433158855599).

12210120212121 is a wasteful number, since it uses less digits than its factorization.

12210120212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240647 (or 240638 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12210120212121 its reverse (12121202101221), we get a palindrome (24331322313342).

The spelling of 12210120212121 in words is "twelve trillion, two hundred ten billion, one hundred twenty million, two hundred twelve thousand, one hundred twenty-one".