11101213431 has 128 divisors (see below), whose sum is σ = 20924006400. Its totient is φ = 5650145280.

The previous prime is 11101213313. The next prime is 11101213433. The reversal of 11101213431 is 13431210111.

It is a happy number.

11101213431 is a `hidden beast` number, since 1 + 110 + 121 + 3 + 431 = 666.

It is not a de Polignac number, because 11101213431 - 2¹⁷ = 11101082359 is a prime.

It is a super-2 number, since 2×11101213431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101213433) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 42209806 + ... + 42210068.

It is an arithmetic number, because the mean of its divisors is an integer number (163468800).

Almost surely, 2^11101213431 is an apocalyptic number.

11101213431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11101213431 is a deficient number, since it is larger than the sum of its proper divisors (9822792969).

11101213431 is a wasteful number, since it uses less digits than its factorization.

11101213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 11101213431 its reverse (13431210111), we get a palindrome (24532423542).

The spelling of 11101213431 in words is "eleven billion, one hundred one million, two hundred thirteen thousand, four hundred thirty-one".