2123121211 has 8 divisors (see below), whose sum is σ = 2320527744. Its totient is φ = 1933772160.

The previous prime is 2123121197. The next prime is 2123121241. The reversal of 2123121211 is 1121213212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123121211 - 2¹⁷ = 2122990139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123121241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013820 + ... + 2014873.

It is an arithmetic number, because the mean of its divisors is an integer number (290065968).

Almost surely, 2^2123121211 is an apocalyptic number.

2123121211 is a deficient number, since it is larger than the sum of its proper divisors (197406533).

2123121211 is a wasteful number, since it uses less digits than its factorization.

2123121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028741.

The product of its digits is 48, while the sum is 16.

The square root of 2123121211 is about 46077.3394522731. The cubic root of 2123121211 is about 1285.2617898396.

Adding to 2123121211 its reverse (1121213212), we get a palindrome (3244334423).

The spelling of 2123121211 in words is "two billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred eleven".