21320212303 has 16 divisors (see below), whose sum is σ = 24178829920. Its totient is φ = 18636552576.

The previous prime is 21320212301. The next prime is 21320212307. The reversal of 21320212303 is 30321202312.

It is a cyclic number.

It is not a de Polignac number, because 21320212303 - 2¹ = 21320212301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320212301) 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, 614701 + ... + 648457.

It is an arithmetic number, because the mean of its divisors is an integer number (1511176870).

Almost surely, 2^21320212303 is an apocalyptic number.

21320212303 is a deficient number, since it is larger than the sum of its proper divisors (2858617617).

21320212303 is a wasteful number, since it uses less digits than its factorization.

21320212303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36346.

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

Adding to 21320212303 its reverse (30321202312), we get a palindrome (51641414615).

Subtracting 21320212303 from its reverse (30321202312), we obtain a palindrome (9000990009).

The spelling of 21320212303 in words is "twenty-one billion, three hundred twenty million, two hundred twelve thousand, three hundred three".