2121020123111 has 16 divisors (see below), whose sum is σ = 2149724966400. Its totient is φ = 2092485339168.

The previous prime is 2121020123107. The next prime is 2121020123137. The reversal of 2121020123111 is 1113210201212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2121020123111 - 2² = 2121020123107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020123111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020123161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93388625 + ... + 93411333.

It is an arithmetic number, because the mean of its divisors is an integer number (134357810400).

Almost surely, 2^{2121020123111} is an apocalyptic number.

2121020123111 is a deficient number, since it is larger than the sum of its proper divisors (28704843289).

2121020123111 is a wasteful number, since it uses less digits than its factorization.

2121020123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26398.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2121020123111 its reverse (1113210201212), we get a palindrome (3234230324323).

The spelling of 2121020123111 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred twenty-three thousand, one hundred eleven".