100203210221 has 4 divisors (see below), whose sum is σ = 100221510972. Its totient is φ = 100184909472.

The previous prime is 100203210209. The next prime is 100203210229. The reversal of 100203210221 is 122012302001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122012302001 = 79 ⋅1544459519.

It can be written as a sum of positive squares in 2 ways, for example, as 80843548900 + 19359661321 = 284330^2 + 139139^2 .

It is a cyclic number.

It is not a de Polignac number, because 100203210221 - 2¹⁸ = 100202948077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100203210196 and 100203210205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100203210229) 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, 9142160 + ... + 9153113.

It is an arithmetic number, because the mean of its divisors is an integer number (25055377743).

Almost surely, 2^100203210221 is an apocalyptic number.

It is an amenable number.

100203210221 is a deficient number, since it is larger than the sum of its proper divisors (18300751).

100203210221 is an equidigital number, since it uses as much as digits as its factorization.

100203210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18300750.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 100203210221 its reverse (122012302001), we get a palindrome (222215512222).

The spelling of 100203210221 in words is "one hundred billion, two hundred three million, two hundred ten thousand, two hundred twenty-one".