21000100021223 has 4 divisors (see below), whose sum is σ = 21017159405088. Its totient is φ = 20983040637360.

The previous prime is 21000100021193. The next prime is 21000100021333. The reversal of 21000100021223 is 32212000100012.

It is a happy number.

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 21000100021223 - 2¹⁰ = 21000100020199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000100021198 and 21000100021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000100011223) 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, 8529690086 + ... + 8529692547.

It is an arithmetic number, because the mean of its divisors is an integer number (5254289851272).

Almost surely, 2^{21000100021223} is an apocalyptic number.

21000100021223 is a deficient number, since it is larger than the sum of its proper divisors (17059383865).

21000100021223 is a wasteful number, since it uses less digits than its factorization.

21000100021223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17059383864.

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

Adding to 21000100021223 its reverse (32212000100012), we get a palindrome (53212100121235).

The spelling of 21000100021223 in words is "twenty-one trillion, one hundred million, twenty-one thousand, two hundred twenty-three".