311242210121 has 4 divisors (see below), whose sum is σ = 311305334544. Its totient is φ = 311179085700.

The previous prime is 311242210079. The next prime is 311242210129. The reversal of 311242210121 is 121012242113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311242210121 is a prime.

It is a super-2 number, since 2×311242210121² (a number of 24 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 = 311242210093 and 311242210102.

It is not an unprimeable number, because it can be changed into a prime (311242210129) 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, 31554815 + ... + 31564676.

It is an arithmetic number, because the mean of its divisors is an integer number (77826333636).

Almost surely, 2^311242210121 is an apocalyptic number.

It is an amenable number.

311242210121 is a deficient number, since it is larger than the sum of its proper divisors (63124423).

311242210121 is an equidigital number, since it uses as much as digits as its factorization.

311242210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63124422.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 311242210121 its reverse (121012242113), we get a palindrome (432254452234).

The spelling of 311242210121 in words is "three hundred eleven billion, two hundred forty-two million, two hundred ten thousand, one hundred twenty-one".