21100000021223 has 4 divisors (see below), whose sum is σ = 21100569389928. Its totient is φ = 21099430652520.

The previous prime is 21100000021189. The next prime is 21100000021253. The reversal of 21100000021223 is 32212000000112.

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 21100000021223 - 2¹⁰ = 21100000020199 is a prime.

It is a super-2 number, since 2×21100000021223² (a number of 27 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 = 21100000021198 and 21100000021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100000021253) 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, 284628761 + ... + 284702882.

It is an arithmetic number, because the mean of its divisors is an integer number (5275142347482).

Almost surely, 2^{21100000021223} is an apocalyptic number.

21100000021223 is a deficient number, since it is larger than the sum of its proper divisors (569368705).

21100000021223 is an equidigital number, since it uses as much as digits as its factorization.

21100000021223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569368704.

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

Adding to 21100000021223 its reverse (32212000000112), we get a palindrome (53312000021335).

The spelling of 21100000021223 in words is "twenty-one trillion, one hundred billion, twenty-one thousand, two hundred twenty-three".