100213231021 has 4 divisors (see below), whose sum is σ = 101246357212. Its totient is φ = 99180104832.

The previous prime is 100213231009. The next prime is 100213231043. The reversal of 100213231021 is 120132312001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35264708521 + 64948522500 = 187789^2 + 254850^2 .

It is a cyclic number.

It is not a de Polignac number, because 100213231021 - 2⁵ = 100213230989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100213230986 and 100213231004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100213231081) 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, 516562950 + ... + 516563143.

It is an arithmetic number, because the mean of its divisors is an integer number (25311589303).

Almost surely, 2^100213231021 is an apocalyptic number.

It is an amenable number.

100213231021 is a deficient number, since it is larger than the sum of its proper divisors (1033126191).

100213231021 is an equidigital number, since it uses as much as digits as its factorization.

100213231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033126190.

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

Adding to 100213231021 its reverse (120132312001), we get a palindrome (220345543022).

The spelling of 100213231021 in words is "one hundred billion, two hundred thirteen million, two hundred thirty-one thousand, twenty-one".