2121011011111 has 4 divisors (see below), whose sum is σ = 2121187670992. Its totient is φ = 2120834351232.

The previous prime is 2121011011109. The next prime is 2121011011129. The reversal of 2121011011111 is 1111101101212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121011011111 - 2¹ = 2121011011109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121011011091 and 2121011011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121011011711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88311930 + ... + 88335943.

It is an arithmetic number, because the mean of its divisors is an integer number (530296917748).

Almost surely, 2^{2121011011111} is an apocalyptic number.

2121011011111 is a deficient number, since it is larger than the sum of its proper divisors (176659881).

2121011011111 is a wasteful number, since it uses less digits than its factorization.

2121011011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176659880.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 2121011011111 its reverse (1111101101212), we get a palindrome (3232112112323).

The spelling of 2121011011111 in words is "two trillion, one hundred twenty-one billion, eleven million, eleven thousand, one hundred eleven".