21003132223 has 4 divisors (see below), whose sum is σ = 21347445928. Its totient is φ = 20658818520.

The previous prime is 21003132217. The next prime is 21003132229. The reversal of 21003132223 is 32223130012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21003132217) and next prime (21003132229).

It is a cyclic number.

It is not a de Polignac number, because 21003132223 - 2³³ = 12413197631 is a prime.

It is a super-2 number, since 2×21003132223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003132223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003132229) 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, 172156761 + ... + 172156882.

It is an arithmetic number, because the mean of its divisors is an integer number (5336861482).

Almost surely, 2^21003132223 is an apocalyptic number.

21003132223 is a deficient number, since it is larger than the sum of its proper divisors (344313705).

21003132223 is an equidigital number, since it uses as much as digits as its factorization.

21003132223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344313704.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003132223 its reverse (32223130012), we get a palindrome (53226262235).

The spelling of 21003132223 in words is "twenty-one billion, three million, one hundred thirty-two thousand, two hundred twenty-three".