212111222131 has 4 divisors (see below), whose sum is σ = 212802138472. Its totient is φ = 211420305792.

The previous prime is 212111222129. The next prime is 212111222137. The reversal of 212111222131 is 131222111212.

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 212111222131 - 2¹ = 212111222129 is a prime.

It is a super-2 number, since 2×212111222131² (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 = 212111222099 and 212111222108.

It is not an unprimeable number, because it can be changed into a prime (212111222137) 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, 345457710 + ... + 345458323.

It is an arithmetic number, because the mean of its divisors is an integer number (53200534618).

Almost surely, 2^212111222131 is an apocalyptic number.

212111222131 is a deficient number, since it is larger than the sum of its proper divisors (690916341).

212111222131 is an equidigital number, since it uses as much as digits as its factorization.

212111222131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690916340.

The product of its digits is 96, while the sum is 19.

Adding to 212111222131 its reverse (131222111212), we get a palindrome (343333333343).

The spelling of 212111222131 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, one hundred thirty-one".