21011300223 has 16 divisors (see below), whose sum is σ = 28944545280. Its totient is φ = 13547329056.

The previous prime is 21011300221. The next prime is 21011300267. The reversal of 21011300223 is 32200311012.

It is not a de Polignac number, because 21011300223 - 2¹ = 21011300221 is a prime.

It is a super-2 number, since 2×21011300223² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011300221) 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, 548203 + ... + 585276.

It is an arithmetic number, because the mean of its divisors is an integer number (1809034080).

Almost surely, 2^21011300223 is an apocalyptic number.

21011300223 is a deficient number, since it is larger than the sum of its proper divisors (7933245057).

21011300223 is a wasteful number, since it uses less digits than its factorization.

21011300223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133686.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21011300223 its reverse (32200311012), we get a palindrome (53211611235).

The spelling of 21011300223 in words is "twenty-one billion, eleven million, three hundred thousand, two hundred twenty-three".