100212313021 has 4 divisors (see below), whose sum is σ = 100255122844. Its totient is φ = 100169503200.

The previous prime is 100212313007. The next prime is 100212313051. The reversal of 100212313021 is 120313212001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120313212001 = 48767 ⋅2467103.

It can be written as a sum of positive squares in 2 ways, for example, as 33707124025 + 66505188996 = 183595^2 + 257886^2 .

It is a cyclic number.

It is not a de Polignac number, because 100212313021 - 2²¹ = 100210215869 is a prime.

It is a super-2 number, since 2×100212313021² (a number of 23 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 = 100212312986 and 100212313004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212313051) 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, 21401400 + ... + 21406081.

It is an arithmetic number, because the mean of its divisors is an integer number (25063780711).

Almost surely, 2^100212313021 is an apocalyptic number.

It is an amenable number.

100212313021 is a deficient number, since it is larger than the sum of its proper divisors (42809823).

100212313021 is an equidigital number, since it uses as much as digits as its factorization.

100212313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42809822.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 100212313021 its reverse (120313212001), we get a palindrome (220525525022).

The spelling of 100212313021 in words is "one hundred billion, two hundred twelve million, three hundred thirteen thousand, twenty-one".