21031323202 has 4 divisors (see below), whose sum is σ = 31546984806. Its totient is φ = 10515661600.

The previous prime is 21031323161. The next prime is 21031323221. The reversal of 21031323202 is 20232313012.

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., 15627750121 + 5403573081 = 125011^2 + 73509^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21031323202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257830799 + ... + 5257830802.

Almost surely, 2^21031323202 is an apocalyptic number.

21031323202 is a deficient number, since it is larger than the sum of its proper divisors (10515661604).

21031323202 is a wasteful number, since it uses less digits than its factorization.

21031323202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515661603.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21031323202 its reverse (20232313012), we get a palindrome (41263636214).

The spelling of 21031323202 in words is "twenty-one billion, thirty-one million, three hundred twenty-three thousand, two hundred two".