11311121421 has 16 divisors (see below), whose sum is σ = 16844958720. Its totient is φ = 7501263840.

The previous prime is 11311121417. The next prime is 11311121431. The reversal of 11311121421 is 12412111311.

11311121421 is a `hidden beast` number, since 1 + 131 + 112 + 1 + 421 = 666.

It is not a de Polignac number, because 11311121421 - 2² = 11311121417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11311121394 and 11311121403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311121431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1091520 + ... + 1101833.

It is an arithmetic number, because the mean of its divisors is an integer number (1052809920).

Almost surely, 2^11311121421 is an apocalyptic number.

It is an amenable number.

11311121421 is a deficient number, since it is larger than the sum of its proper divisors (5533837299).

11311121421 is a wasteful number, since it uses less digits than its factorization.

11311121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193553 (or 2193547 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 11311121421 its reverse (12412111311), we get a palindrome (23723232732).

The spelling of 11311121421 in words is "eleven billion, three hundred eleven million, one hundred twenty-one thousand, four hundred twenty-one".