2121121110111 has 8 divisors (see below), whose sum is σ = 2840843819520. Its totient is φ = 1407739570392.

The previous prime is 2121121110041. The next prime is 2121121110131. The reversal of 2121121110111 is 1110111211212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121121110111 - 2¹³ = 2121121101919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121110131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1585291641 + ... + 1585292978.

It is an arithmetic number, because the mean of its divisors is an integer number (355105477440).

Almost surely, 2^{2121121110111} is an apocalyptic number.

2121121110111 is a deficient number, since it is larger than the sum of its proper divisors (719722709409).

2121121110111 is a wasteful number, since it uses less digits than its factorization.

2121121110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170584845.

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

Adding to 2121121110111 its reverse (1110111211212), we get a palindrome (3231232321323).

The spelling of 2121121110111 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred ten thousand, one hundred eleven".