2121001022111 has 4 divisors (see below), whose sum is σ = 2121005754912. Its totient is φ = 2120996289312.

The previous prime is 2121001022093. The next prime is 2121001022171. The reversal of 2121001022111 is 1112201001212.

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 2121001022111 - 2²⁶ = 2120933913247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121001022171) 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, 1614551 + ... + 2617016.

It is an arithmetic number, because the mean of its divisors is an integer number (530251438728).

Almost surely, 2^{2121001022111} is an apocalyptic number.

2121001022111 is a deficient number, since it is larger than the sum of its proper divisors (4732801).

2121001022111 is an equidigital number, since it uses as much as digits as its factorization.

2121001022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732800.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121001022111 its reverse (1112201001212), we get a palindrome (3233202023323).

The spelling of 2121001022111 in words is "two trillion, one hundred twenty-one billion, one million, twenty-two thousand, one hundred eleven".