21320402312 has 48 divisors (see below), whose sum is σ = 44660748300. Its totient is φ = 9532195200.

The previous prime is 21320402261. The next prime is 21320402377.

21320402312 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 19843229956 + 1477172356 = 140866^2 + 38434^2 .

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 in 11 ways as a sum of consecutive naturals, for example, 121487 + ... + 239582.

Almost surely, 2^21320402312 is an apocalyptic number.

21320402312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21320402312 is an abundant number, since it is smaller than the sum of its proper divisors (23340345988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21320402312 is a wasteful number, since it uses less digits than its factorization.

21320402312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361158 (or 361143 counting only the distinct ones).

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

The spelling of 21320402312 in words is "twenty-one billion, three hundred twenty million, four hundred two thousand, three hundred twelve".