2121022001111 has 4 divisors (see below), whose sum is σ = 2284177539672. Its totient is φ = 1957866462552.

The previous prime is 2121022001029. The next prime is 2121022001117. The reversal of 2121022001111 is 1111002201212.

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

It is not a de Polignac number, because 2121022001111 - 2¹⁸ = 2121021738967 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 (2121022001117) 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, 81577769261 + ... + 81577769286.

It is an arithmetic number, because the mean of its divisors is an integer number (571044384918).

Almost surely, 2^{2121022001111} is an apocalyptic number.

2121022001111 is a deficient number, since it is larger than the sum of its proper divisors (163155538561).

2121022001111 is a wasteful number, since it uses less digits than its factorization.

2121022001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163155538560.

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

Adding to 2121022001111 its reverse (1111002201212), we get a palindrome (3232024202323).

The spelling of 2121022001111 in words is "two trillion, one hundred twenty-one billion, twenty-two million, one thousand, one hundred eleven".