211223303131 has 4 divisors (see below), whose sum is σ = 211424661000. Its totient is φ = 211021945264.

The previous prime is 211223303119. The next prime is 211223303141. The reversal of 211223303131 is 131303322112.

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 211223303131 - 2¹³ = 211223294939 is a prime.

It is a super-2 number, since 2×211223303131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211223303101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100677361 + ... + 100679458.

It is an arithmetic number, because the mean of its divisors is an integer number (52856165250).

Almost surely, 2^211223303131 is an apocalyptic number.

211223303131 is a deficient number, since it is larger than the sum of its proper divisors (201357869).

211223303131 is a wasteful number, since it uses less digits than its factorization.

211223303131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201357868.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 211223303131 its reverse (131303322112), we get a palindrome (342526625243).

The spelling of 211223303131 in words is "two hundred eleven billion, two hundred twenty-three million, three hundred three thousand, one hundred thirty-one".