2121111011121 has 4 divisors (see below), whose sum is σ = 2828148014832. Its totient is φ = 1414074007412.

The previous prime is 2121111011101. The next prime is 2121111011143. The reversal of 2121111011121 is 1211101111212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121111011121 - 2⁶ = 2121111011057 is a prime.

It is a super-2 number, since 2×2121111011121² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121111011121.

It is not an unprimeable number, because it can be changed into a prime (2121111011101) 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, 353518501851 + ... + 353518501856.

It is an arithmetic number, because the mean of its divisors is an integer number (707037003708).

Almost surely, 2^{2121111011121} is an apocalyptic number.

It is an amenable number.

2121111011121 is a deficient number, since it is larger than the sum of its proper divisors (707037003711).

2121111011121 is an equidigital number, since it uses as much as digits as its factorization.

2121111011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707037003710.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 2121111011121 its reverse (1211101111212), we get a palindrome (3332212122333).

The spelling of 2121111011121 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, eleven thousand, one hundred twenty-one".