21312103202 has 8 divisors (see below), whose sum is σ = 34427243676. Its totient is φ = 9836355312.

The previous prime is 21312103181. The next prime is 21312103207. The reversal of 21312103202 is 20230121312.

It can be written as a sum of positive squares in 2 ways, for example, as 19985759641 + 1326343561 = 141371^2 + 36419^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21312103207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409848113 + ... + 409848164.

Almost surely, 2^21312103202 is an apocalyptic number.

21312103202 is a deficient number, since it is larger than the sum of its proper divisors (13115140474).

21312103202 is a wasteful number, since it uses less digits than its factorization.

21312103202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819696292.

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

Adding to 21312103202 its reverse (20230121312), we get a palindrome (41542224514).

The spelling of 21312103202 in words is "twenty-one billion, three hundred twelve million, one hundred three thousand, two hundred two".