21213203100223 has 4 divisors (see below), whose sum is σ = 21293861667408. Its totient is φ = 21132544533040.

The previous prime is 21213203100209. The next prime is 21213203100283. The reversal of 21213203100223 is 32200130231212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213203100223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213203100194 and 21213203100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213203100283) 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, 40329283198 + ... + 40329283723.

It is an arithmetic number, because the mean of its divisors is an integer number (5323465416852).

Almost surely, 2^{21213203100223} is an apocalyptic number.

21213203100223 is a deficient number, since it is larger than the sum of its proper divisors (80658567185).

21213203100223 is an equidigital number, since it uses as much as digits as its factorization.

21213203100223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80658567184.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21213203100223 its reverse (32200130231212), we get a palindrome (53413333331435).

The spelling of 21213203100223 in words is "twenty-one trillion, two hundred thirteen billion, two hundred three million, one hundred thousand, two hundred twenty-three".