100221031231031 has 4 divisors (see below), whose sum is σ = 101213318669064. Its totient is φ = 99228743793000.

The previous prime is 100221031231003. The next prime is 100221031231043. The reversal of 100221031231031 is 130132130122001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100221031231031 - 2⁴⁶ = 29852287053367 is a prime.

It is a super-2 number, since 2×100221031231031² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221031230994 and 100221031231012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221031234031) 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, 496143718865 + ... + 496143719066.

It is an arithmetic number, because the mean of its divisors is an integer number (25303329667266).

Almost surely, 2^{100221031231031} is an apocalyptic number.

100221031231031 is a deficient number, since it is larger than the sum of its proper divisors (992287438033).

100221031231031 is an equidigital number, since it uses as much as digits as its factorization.

100221031231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992287438032.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 100221031231031 its reverse (130132130122001), we get a palindrome (230353161353032).

The spelling of 100221031231031 in words is "one hundred trillion, two hundred twenty-one billion, thirty-one million, two hundred thirty-one thousand, thirty-one".