21212232303 has 8 divisors (see below), whose sum is σ = 28325767216. Its totient is φ = 14120092800.

The previous prime is 21212232281. The next prime is 21212232311. The reversal of 21212232303 is 30323221212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212232303 - 2⁸ = 21212232047 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 21212232303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212232343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5346538 + ... + 5350503.

It is an arithmetic number, because the mean of its divisors is an integer number (3540720902).

Almost surely, 2^21212232303 is an apocalyptic number.

21212232303 is a deficient number, since it is larger than the sum of its proper divisors (7113534913).

21212232303 is a wasteful number, since it uses less digits than its factorization.

21212232303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10697705.

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

Adding to 21212232303 its reverse (30323221212), we get a palindrome (51535453515).

The spelling of 21212232303 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-two thousand, three hundred three".