11100121231 has 2 divisors, whose sum is σ = 11100121232. Its totient is φ = 11100121230.

The previous prime is 11100121211. The next prime is 11100121259. The reversal of 11100121231 is 13212100111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11100121231 - 2²¹ = 11098024079 is a prime.

It is a super-3 number, since 3×11100121231³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11100121211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550060615 + 5550060616.

It is an arithmetic number, because the mean of its divisors is an integer number (5550060616).

Almost surely, 2^11100121231 is an apocalyptic number.

11100121231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100121231 is an equidigital number, since it uses as much as digits as its factorization.

11100121231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11100121231 its reverse (13212100111), we get a palindrome (24312221342).

The spelling of 11100121231 in words is "eleven billion, one hundred million, one hundred twenty-one thousand, two hundred thirty-one".