21310220223 has 6 divisors (see below), whose sum is σ = 30781429224. Its totient is φ = 14206813476.

The previous prime is 21310220221. The next prime is 21310220287. The reversal of 21310220223 is 32202201312.

21310220223 is a `hidden beast` number, since 213 + 10 + 220 + 223 = 666.

It is not a de Polignac number, because 21310220223 - 2¹ = 21310220221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310220196 and 21310220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310220221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183901115 + ... + 1183901132.

It is an arithmetic number, because the mean of its divisors is an integer number (5130238204).

Almost surely, 2^21310220223 is an apocalyptic number.

21310220223 is a deficient number, since it is larger than the sum of its proper divisors (9471209001).

21310220223 is a wasteful number, since it uses less digits than its factorization.

21310220223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367802253 (or 2367802250 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21310220223 its reverse (32202201312), we get a palindrome (53512421535).

The spelling of 21310220223 in words is "twenty-one billion, three hundred ten million, two hundred twenty thousand, two hundred twenty-three".