312121221243011 has 4 divisors (see below), whose sum is σ = 312121267650024. Its totient is φ = 312121174836000.

The previous prime is 312121221243001. The next prime is 312121221243053. The reversal of 312121221243011 is 110342122121213.

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 312121221243011 - 2³⁴ = 312104041373827 is a prime.

It is a super-2 number, since 2×312121221243011² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312121221243001) 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, 10962230 + ... + 27283931.

It is an arithmetic number, because the mean of its divisors is an integer number (78030316912506).

Almost surely, 2^{312121221243011} is an apocalyptic number.

312121221243011 is a deficient number, since it is larger than the sum of its proper divisors (46407013).

312121221243011 is an equidigital number, since it uses as much as digits as its factorization.

312121221243011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46407012.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 312121221243011 its reverse (110342122121213), we get a palindrome (422463343364224).

The spelling of 312121221243011 in words is "three hundred twelve trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred forty-three thousand, eleven".