2121213111 has 16 divisors (see below), whose sum is σ = 2992826880. Its totient is φ = 1333603040.

The previous prime is 2121213089. The next prime is 2121213113. The reversal of 2121213111 is 1113121212.

It is a cyclic number.

It is not a de Polignac number, because 2121213111 - 2⁵ = 2121213079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121213113) 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, 211596 + ... + 221393.

It is an arithmetic number, because the mean of its divisors is an integer number (187051680).

Almost surely, 2^2121213111 is an apocalyptic number.

2121213111 is a deficient number, since it is larger than the sum of its proper divisors (871613769).

2121213111 is a wasteful number, since it uses less digits than its factorization.

2121213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433086.

The product of its digits is 24, while the sum is 15.

The square root of 2121213111 is about 46056.6293925207. The cubic root of 2121213111 is about 1284.8766425614.

Adding to 2121213111 its reverse (1113121212), we get a palindrome (3234334323).

The spelling of 2121213111 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, one hundred eleven".