211221144131 has 4 divisors (see below), whose sum is σ = 211459274832. Its totient is φ = 210983013432.

The previous prime is 211221144109. The next prime is 211221144221. The reversal of 211221144131 is 131441122112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211221144131 - 2⁶ = 211221144067 is a prime.

It is a super-2 number, since 2×211221144131² (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 = 211221144097 and 211221144106.

It is not an unprimeable number, because it can be changed into a prime (211221144031) 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, 119064020 + ... + 119065793.

It is an arithmetic number, because the mean of its divisors is an integer number (52864818708).

Almost surely, 2^211221144131 is an apocalyptic number.

211221144131 is a deficient number, since it is larger than the sum of its proper divisors (238130701).

211221144131 is an equidigital number, since it uses as much as digits as its factorization.

211221144131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238130700.

The product of its digits is 384, while the sum is 23.

Adding to 211221144131 its reverse (131441122112), we get a palindrome (342662266243).

The spelling of 211221144131 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred forty-four thousand, one hundred thirty-one".