11111021431 has 4 divisors (see below), whose sum is σ = 11129758992. Its totient is φ = 11092283872.

The previous prime is 11111021329. The next prime is 11111021501. The reversal of 11111021431 is 13412011111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13412011111 = 4871 ⋅2753441.

It is a cyclic number.

It is not a de Polignac number, because 11111021431 - 2⁷ = 11111021303 is a prime.

It is a super-2 number, since 2×11111021431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111021731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9367891 + ... + 9369076.

It is an arithmetic number, because the mean of its divisors is an integer number (2782439748).

Almost surely, 2^11111021431 is an apocalyptic number.

11111021431 is a deficient number, since it is larger than the sum of its proper divisors (18737561).

11111021431 is an equidigital number, since it uses as much as digits as its factorization.

11111021431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18737560.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 11111021431 its reverse (13412011111), we get a palindrome (24523032542).

The spelling of 11111021431 in words is "eleven billion, one hundred eleven million, twenty-one thousand, four hundred thirty-one".