211211212201121 has 4 divisors (see below), whose sum is σ = 230412231492144. Its totient is φ = 192010192910100.

The previous prime is 211211212201097. The next prime is 211211212201133. The reversal of 211211212201121 is 121102212112112.

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 211211212201121 - 2²⁶ = 211211145092257 is a prime.

It is a super-2 number, since 2×211211212201121² (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 = 211211212201093 and 211211212201102.

It is not an unprimeable number, because it can be changed into a prime (211211212201151) 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, 9600509645495 + ... + 9600509645516.

It is an arithmetic number, because the mean of its divisors is an integer number (57603057873036).

Almost surely, 2^{211211212201121} is an apocalyptic number.

It is an amenable number.

211211212201121 is a deficient number, since it is larger than the sum of its proper divisors (19201019291023).

211211212201121 is a wasteful number, since it uses less digits than its factorization.

211211212201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19201019291022.

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

Adding to 211211212201121 its reverse (121102212112112), we get a palindrome (332313424313233).

The spelling of 211211212201121 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twelve million, two hundred one thousand, one hundred twenty-one".