2121112121011 has 4 divisors (see below), whose sum is σ = 2284274591872. Its totient is φ = 1957949650152.

The previous prime is 2121112120997. The next prime is 2121112121021. The reversal of 2121112121011 is 1101212111212.

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 2121112121011 - 2²³ = 2121103732403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121112121021) 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, 81581235411 + ... + 81581235436.

It is an arithmetic number, because the mean of its divisors is an integer number (571068647968).

Almost surely, 2^{2121112121011} is an apocalyptic number.

2121112121011 is a deficient number, since it is larger than the sum of its proper divisors (163162470861).

2121112121011 is a wasteful number, since it uses less digits than its factorization.

2121112121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163162470860.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 2121112121011 its reverse (1101212111212), we get a palindrome (3222324232223).

The spelling of 2121112121011 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, eleven".