21000223103 has 4 divisors (see below), whose sum is σ = 21002084208. Its totient is φ = 20998362000.

The previous prime is 21000223087. The next prime is 21000223109. The reversal of 21000223103 is 30132200012.

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 21000223103 - 2⁴ = 21000223087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000223109) 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, 913523 + ... + 936228.

It is an arithmetic number, because the mean of its divisors is an integer number (5250521052).

Almost surely, 2^21000223103 is an apocalyptic number.

21000223103 is a deficient number, since it is larger than the sum of its proper divisors (1861105).

21000223103 is a wasteful number, since it uses less digits than its factorization.

21000223103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861104.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000223103 its reverse (30132200012), we get a palindrome (51132423115).

The spelling of 21000223103 in words is "twenty-one billion, two hundred twenty-three thousand, one hundred three".