100031221111 has 4 divisors (see below), whose sum is σ = 100121912352. Its totient is φ = 99940529872.

The previous prime is 100031221067. The next prime is 100031221133. The reversal of 100031221111 is 111122130001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111122130001 = 29363 ⋅3784427.

It is a cyclic number.

It is not a de Polignac number, because 100031221111 - 2²¹ = 100029123959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100031221091 and 100031221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100031228111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45343966 + ... + 45346171.

It is an arithmetic number, because the mean of its divisors is an integer number (25030478088).

Almost surely, 2^100031221111 is an apocalyptic number.

100031221111 is a deficient number, since it is larger than the sum of its proper divisors (90691241).

100031221111 is an equidigital number, since it uses as much as digits as its factorization.

100031221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90691240.

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

Adding to 100031221111 its reverse (111122130001), we get a palindrome (211153351112).

The spelling of 100031221111 in words is "one hundred billion, thirty-one million, two hundred twenty-one thousand, one hundred eleven".