211211112112001 has 4 divisors (see below), whose sum is σ = 211349793080112. Its totient is φ = 211072431143892.

The previous prime is 211211112111947. The next prime is 211211112112003. The reversal of 211211112112001 is 100211211112112.

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 211211112112001 - 2²⁶ = 211211045003137 is a prime.

It is a super-2 number, since 2×211211112112001² (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 (211211112112003) 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, 69340481771 + ... + 69340484816.

It is an arithmetic number, because the mean of its divisors is an integer number (52837448270028).

Almost surely, 2^{211211112112001} is an apocalyptic number.

It is an amenable number.

211211112112001 is a deficient number, since it is larger than the sum of its proper divisors (138680968111).

211211112112001 is a wasteful number, since it uses less digits than its factorization.

211211112112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138680968110.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211211112112001 its reverse (100211211112112), we get a palindrome (311422323224113).

The spelling of 211211112112001 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred twelve million, one hundred twelve thousand, one".