211212121102121 has 4 divisors (see below), whose sum is σ = 211212852282000. Its totient is φ = 211211389922244.

The previous prime is 211212121102051. The next prime is 211212121102187. The reversal of 211212121102121 is 121201121212112.

It is a happy number.

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 211212121102121 - 2³⁴ = 211194941232937 is a prime.

It is a super-2 number, since 2×211212121102121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211212121102093 and 211212121102102.

It is not an unprimeable number, because it can be changed into a prime (211212121102621) 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, 365156471 + ... + 365734428.

It is an arithmetic number, because the mean of its divisors is an integer number (52803213070500).

Almost surely, 2^{211212121102121} is an apocalyptic number.

It is an amenable number.

211212121102121 is a deficient number, since it is larger than the sum of its proper divisors (731179879).

211212121102121 is an equidigital number, since it uses as much as digits as its factorization.

211212121102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731179878.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211212121102121 its reverse (121201121212112), we get a palindrome (332413242314233).

The spelling of 211212121102121 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".