100221031 has 8 divisors (see below), whose sum is σ = 102286800. Its totient is φ = 98176320.

The previous prime is 100221019. The next prime is 100221073. The reversal of 100221031 is 130122001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100221031 - 2⁷ = 100220903 is a prime.

It is a super-2 number, since 2×100221031² = 20088510109405922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100220999 and 100221017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4536 + ... + 14866.

It is an arithmetic number, because the mean of its divisors is an integer number (12785850).

Almost surely, 2^100221031 is an apocalyptic number.

100221031 is a deficient number, since it is larger than the sum of its proper divisors (2065769).

100221031 is a wasteful number, since it uses less digits than its factorization.

100221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10529.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 100221031 is about 10011.0454499018. The cubic root of 100221031 is about 464.5006100513.

Adding to 100221031 its reverse (130122001), we get a palindrome (230343032).

The spelling of 100221031 in words is "one hundred million, two hundred twenty-one thousand, thirty-one".