100212031 has 4 divisors (see below), whose sum is σ = 101910600. Its totient is φ = 98513464.

The previous prime is 100211981. The next prime is 100212043. The reversal of 100212031 is 130212001.

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 100212031 - 2⁹ = 100211519 is a prime.

It is a super-2 number, since 2×100212031² = 20084902314289922, 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 = 100211999 and 100212017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212071) 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, 849196 + ... + 849313.

It is an arithmetic number, because the mean of its divisors is an integer number (25477650).

Almost surely, 2^100212031 is an apocalyptic number.

100212031 is a deficient number, since it is larger than the sum of its proper divisors (1698569).

100212031 is an equidigital number, since it uses as much as digits as its factorization.

100212031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698568.

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

The square root of 100212031 is about 10010.5959363067. The cubic root of 100212031 is about 464.4867053496.

Adding to 100212031 its reverse (130212001), we get a palindrome (230424032).

The spelling of 100212031 in words is "one hundred million, two hundred twelve thousand, thirty-one".