21212300303 has 16 divisors (see below), whose sum is σ = 21707642880. Its totient is φ = 20723018400.

The previous prime is 21212300269. The next prime is 21212300327. The reversal of 21212300303 is 30300321212.

It is a cyclic number.

It is not a de Polignac number, because 21212300303 - 2²⁴ = 21195523087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212300363) 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, 5988713 + ... + 5992253.

It is an arithmetic number, because the mean of its divisors is an integer number (1356727680).

Almost surely, 2^21212300303 is an apocalyptic number.

21212300303 is a deficient number, since it is larger than the sum of its proper divisors (495342577).

21212300303 is a wasteful number, since it uses less digits than its factorization.

21212300303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21212300303 its reverse (30300321212), we get a palindrome (51512621515).

The spelling of 21212300303 in words is "twenty-one billion, two hundred twelve million, three hundred thousand, three hundred three".