11131121421 has 12 divisors (see below), whose sum is σ = 18375184672. Its totient is φ = 6360640776.

The previous prime is 11131121383. The next prime is 11131121429. The reversal of 11131121421 is 12412113111.

It is not a de Polignac number, because 11131121421 - 2⁷ = 11131121293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11131121394 and 11131121403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131121429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88342171 + ... + 88342296.

Almost surely, 2^11131121421 is an apocalyptic number.

It is an amenable number.

11131121421 is a deficient number, since it is larger than the sum of its proper divisors (7244063251).

11131121421 is a wasteful number, since it uses less digits than its factorization.

11131121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176684480 (or 176684477 counting only the distinct ones).

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

Adding to 11131121421 its reverse (12412113111), we get a palindrome (23543234532).

The spelling of 11131121421 in words is "eleven billion, one hundred thirty-one million, one hundred twenty-one thousand, four hundred twenty-one".