212111121102121 has 4 divisors (see below), whose sum is σ = 224588245872852. Its totient is φ = 199633996331392.

The previous prime is 212111121102103. The next prime is 212111121102149. The reversal of 212111121102121 is 121201121111212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161179148053225 + 50931973048896 = 12695635^2 + 7136664^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111121102121 - 2¹⁷ = 212111120971049 is a prime.

It is a super-2 number, since 2×212111121102121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212111121108121) 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, 6238562385340 + ... + 6238562385373.

It is an arithmetic number, because the mean of its divisors is an integer number (56147061468213).

Almost surely, 2^{212111121102121} is an apocalyptic number.

It is an amenable number.

212111121102121 is a deficient number, since it is larger than the sum of its proper divisors (12477124770731).

212111121102121 is a wasteful number, since it uses less digits than its factorization.

212111121102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12477124770730.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 212111121102121 its reverse (121201121111212), we get a palindrome (333312242213333).

Subtracting from 212111121102121 its reverse (121201121111212), we obtain a palindrome (90909999990909).

The spelling of 212111121102121 in words is "two hundred twelve trillion, one hundred eleven billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".