100031221011 has 32 divisors (see below), whose sum is σ = 138836920320. Its totient is φ = 63995040000.

The previous prime is 100031220979. The next prime is 100031221051. The reversal of 100031221011 is 110122130001.

It is not a de Polignac number, because 100031221011 - 2⁵ = 100031220979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100031221051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5336191 + ... + 5354903.

It is an arithmetic number, because the mean of its divisors is an integer number (4338653760).

Almost surely, 2^100031221011 is an apocalyptic number.

100031221011 is a deficient number, since it is larger than the sum of its proper divisors (38805699309).

100031221011 is a wasteful number, since it uses less digits than its factorization.

100031221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19227.

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

Adding to 100031221011 its reverse (110122130001), we get a palindrome (210153351012).

The spelling of 100031221011 in words is "one hundred billion, thirty-one million, two hundred twenty-one thousand, eleven".