21212223303 has 4 divisors (see below), whose sum is σ = 28282964408. Its totient is φ = 14141482200.

The previous prime is 21212223299. The next prime is 21212223323. The reversal of 21212223303 is 30332221212.

It is a happy number.

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

It is not a de Polignac number, because 21212223303 - 2² = 21212223299 is a prime.

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 21212223303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212223323) 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, 3535370548 + ... + 3535370553.

It is an arithmetic number, because the mean of its divisors is an integer number (7070741102).

Almost surely, 2^21212223303 is an apocalyptic number.

21212223303 is a deficient number, since it is larger than the sum of its proper divisors (7070741105).

21212223303 is an equidigital number, since it uses as much as digits as its factorization.

21212223303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070741104.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21212223303 its reverse (30332221212), we get a palindrome (51544444515).

The spelling of 21212223303 in words is "twenty-one billion, two hundred twelve million, two hundred twenty-three thousand, three hundred three".