2112212121101 has 4 divisors (see below), whose sum is σ = 2112232101600. Its totient is φ = 2112192140604.

The previous prime is 2112212121067. The next prime is 2112212121113. The reversal of 2112212121101 is 1011212122112.

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 2112212121101 - 2¹⁸ = 2112211858957 is a prime.

It is a super-2 number, since 2×2112212121101² (a number of 25 digits) contains 22 as substring.

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 2112212121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112212121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9830831 + ... + 10043388.

It is an arithmetic number, because the mean of its divisors is an integer number (528058025400).

Almost surely, 2^{2112212121101} is an apocalyptic number.

It is an amenable number.

2112212121101 is a deficient number, since it is larger than the sum of its proper divisors (19980499).

2112212121101 is a wasteful number, since it uses less digits than its factorization.

2112212121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19980498.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2112212121101 its reverse (1011212122112), we get a palindrome (3123424243213).

The spelling of 2112212121101 in words is "two trillion, one hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, one hundred one".