21111312202 has 4 divisors (see below), whose sum is σ = 31666968306. Its totient is φ = 10555656100.

The previous prime is 21111312163. The next prime is 21111312227. The reversal of 21111312202 is 20221311112.

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., 19619885041 + 1491427161 = 140071^2 + 38619^2 .

It is an unprimeable number.

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, 5277828049 + ... + 5277828052.

Almost surely, 2^21111312202 is an apocalyptic number.

21111312202 is a deficient number, since it is larger than the sum of its proper divisors (10555656104).

21111312202 is a wasteful number, since it uses less digits than its factorization.

21111312202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555656103.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21111312202 its reverse (20221311112), we get a palindrome (41332623314).

The spelling of 21111312202 in words is "twenty-one billion, one hundred eleven million, three hundred twelve thousand, two hundred two".