11211121123031 has 4 divisors (see below), whose sum is σ = 11422651710312. Its totient is φ = 10999590535752.

The previous prime is 11211121122991. The next prime is 11211121123043. The reversal of 11211121123031 is 13032112111211.

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 11211121123031 - 2¹⁸ = 11211120860887 is a prime.

It is a super-2 number, since 2×11211121123031² (a number of 27 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 = 11211121122994 and 11211121123012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211121123231) 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, 105765293561 + ... + 105765293666.

It is an arithmetic number, because the mean of its divisors is an integer number (2855662927578).

Almost surely, 2^{11211121123031} is an apocalyptic number.

11211121123031 is a deficient number, since it is larger than the sum of its proper divisors (211530587281).

11211121123031 is an equidigital number, since it uses as much as digits as its factorization.

11211121123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211530587280.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 11211121123031 its reverse (13032112111211), we get a palindrome (24243233234242).

The spelling of 11211121123031 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-three thousand, thirty-one".