21312403202 has 4 divisors (see below), whose sum is σ = 31968604806. Its totient is φ = 10656201600.

The previous prime is 21312403201. The next prime is 21312403247. The reversal of 21312403202 is 20230421312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21304613521 + 7789681 = 145961^2 + 2791^2 .

It is not an unprimeable number, because it can be changed into a prime (21312403201) 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 as a sum of consecutive naturals, namely, 5328100799 + ... + 5328100802.

Almost surely, 2^21312403202 is an apocalyptic number.

21312403202 is a deficient number, since it is larger than the sum of its proper divisors (10656201604).

21312403202 is a wasteful number, since it uses less digits than its factorization.

21312403202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656201603.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21312403202 its reverse (20230421312), we get a palindrome (41542824514).

The spelling of 21312403202 in words is "twenty-one billion, three hundred twelve million, four hundred three thousand, two hundred two".