211211220131 has 4 divisors (see below), whose sum is σ = 211212294600. Its totient is φ = 211210145664.

The previous prime is 211211220127. The next prime is 211211220173. The reversal of 211211220131 is 131022112112.

It is a happy number.

211211220131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 211211220131 - 2² = 211211220127 is a prime.

It is a super-3 number, since 3×211211220131³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211211223131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148721 + ... + 666738.

It is an arithmetic number, because the mean of its divisors is an integer number (52803073650).

Almost surely, 2^211211220131 is an apocalyptic number.

211211220131 is a deficient number, since it is larger than the sum of its proper divisors (1074469).

211211220131 is an equidigital number, since it uses as much as digits as its factorization.

211211220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074468.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 211211220131 its reverse (131022112112), we get a palindrome (342233332243).

The spelling of 211211220131 in words is "two hundred eleven billion, two hundred eleven million, two hundred twenty thousand, one hundred thirty-one".