211211100121 has 16 divisors (see below), whose sum is σ = 242727698304. Its totient is φ = 180033053184.

The previous prime is 211211100101. The next prime is 211211100151. The reversal of 211211100121 is 121001112112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211211100121 - 2⁷ = 211211099993 is a prime.

It is a super-2 number, since 2×211211100121² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211211100101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 847561 + ... + 1068073.

It is an arithmetic number, because the mean of its divisors is an integer number (15170481144).

Almost surely, 2^211211100121 is an apocalyptic number.

It is an amenable number.

211211100121 is a deficient number, since it is larger than the sum of its proper divisors (31516598183).

211211100121 is a wasteful number, since it uses less digits than its factorization.

211211100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221280.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211211100121 its reverse (121001112112), we get a palindrome (332212212233).

The spelling of 211211100121 in words is "two hundred eleven billion, two hundred eleven million, one hundred thousand, one hundred twenty-one".