2123211123121 has 16 divisors (see below), whose sum is σ = 2391390720000. Its totient is φ = 1867581349200.

The previous prime is 2123211123119. The next prime is 2123211123127. The reversal of 2123211123121 is 1213211123212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2123211123121 - 2¹ = 2123211123119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123211123092 and 2123211123101.

It is not an unprimeable number, because it can be changed into a prime (2123211123127) 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, 1273380 + ... + 2422378.

It is an arithmetic number, because the mean of its divisors is an integer number (149461920000).

Almost surely, 2^{2123211123121} is an apocalyptic number.

It is an amenable number.

2123211123121 is a deficient number, since it is larger than the sum of its proper divisors (268179596879).

2123211123121 is a wasteful number, since it uses less digits than its factorization.

2123211123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154460.

The product of its digits is 288, while the sum is 22.

Adding to 2123211123121 its reverse (1213211123212), we get a palindrome (3336422246333).

Subtracting from 2123211123121 its reverse (1213211123212), we obtain a palindrome (909999999909).

The spelling of 2123211123121 in words is "two trillion, one hundred twenty-three billion, two hundred eleven million, one hundred twenty-three thousand, one hundred twenty-one".