21312030123203 has 8 divisors (see below), whose sum is σ = 21333951190800. Its totient is φ = 21290110149600.

The previous prime is 21312030123193. The next prime is 21312030123229. The reversal of 21312030123203 is 30232103021312.

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

It is a cyclic number.

It is not a de Polignac number, because 21312030123203 - 2¹⁶ = 21312030057667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312030123103) 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, 42071873 + ... + 42575421.

It is an arithmetic number, because the mean of its divisors is an integer number (2666743898850).

Almost surely, 2^{21312030123203} is an apocalyptic number.

21312030123203 is a deficient number, since it is larger than the sum of its proper divisors (21921067597).

21312030123203 is an equidigital number, since it uses as much as digits as its factorization.

21312030123203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546997.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21312030123203 its reverse (30232103021312), we get a palindrome (51544133144515).

The spelling of 21312030123203 in words is "twenty-one trillion, three hundred twelve billion, thirty million, one hundred twenty-three thousand, two hundred three".