21312102203 has 8 divisors (see below), whose sum is σ = 24362918880. Its totient is φ = 18262843200.

The previous prime is 21312102199. The next prime is 21312102221. The reversal of 21312102203 is 30220121312.

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

It is not a de Polignac number, because 21312102203 - 2² = 21312102199 is a prime.

It is a super-2 number, since 2×21312102203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312102263) 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, 359948 + ... + 414953.

It is an arithmetic number, because the mean of its divisors is an integer number (3045364860).

Almost surely, 2^21312102203 is an apocalyptic number.

21312102203 is a deficient number, since it is larger than the sum of its proper divisors (3050816677).

21312102203 is an equidigital number, since it uses as much as digits as its factorization.

21312102203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778837.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21312102203 its reverse (30220121312), we get a palindrome (51532223515).

The spelling of 21312102203 in words is "twenty-one billion, three hundred twelve million, one hundred two thousand, two hundred three".