21000023223 has 16 divisors (see below), whose sum is σ = 28864688640. Its totient is φ = 13574188224.

The previous prime is 21000023221. The next prime is 21000023273. The reversal of 21000023223 is 32232000012.

It is not a de Polignac number, because 21000023223 - 2¹ = 21000023221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000023221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799711 + ... + 825552.

It is an arithmetic number, because the mean of its divisors is an integer number (1804043040).

Almost surely, 2^21000023223 is an apocalyptic number.

21000023223 is a deficient number, since it is larger than the sum of its proper divisors (7864665417).

21000023223 is a wasteful number, since it uses less digits than its factorization.

21000023223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625398.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21000023223 its reverse (32232000012), we get a palindrome (53232023235).

The spelling of 21000023223 in words is "twenty-one billion, twenty-three thousand, two hundred twenty-three".