211212100121 has 4 divisors (see below), whose sum is σ = 230413200144. Its totient is φ = 192011000100.

The previous prime is 211212100103. The next prime is 211212100139. The reversal of 211212100121 is 121001212112.

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 an interprime number because it is at equal distance from previous prime (211212100103) and next prime (211212100139).

It is a cyclic number.

It is not a de Polignac number, because 211212100121 - 2¹⁰ = 211212099097 is a prime.

It is a super-2 number, since 2×211212100121² (a number of 23 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 = 211212100096 and 211212100105.

It is not an unprimeable number, because it can be changed into a prime (211212100921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9600549995 + ... + 9600550016.

It is an arithmetic number, because the mean of its divisors is an integer number (57603300036).

Almost surely, 2^211212100121 is an apocalyptic number.

It is an amenable number.

211212100121 is a deficient number, since it is larger than the sum of its proper divisors (19201100023).

211212100121 is a wasteful number, since it uses less digits than its factorization.

211212100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19201100022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211212100121 its reverse (121001212112), we get a palindrome (332213312233).

It can be divided in two parts, 2112 and 12100121, that multiplied together give a palindrome (25555455552).

The spelling of 211212100121 in words is "two hundred eleven billion, two hundred twelve million, one hundred thousand, one hundred twenty-one".