21320002312 has 24 divisors (see below), whose sum is σ = 46501536510. Its totient is φ = 9137143680.

The previous prime is 21320002307. The next prime is 21320002321.

21320002312 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 21276889956 + 43112356 = 145866^2 + 6566^2 .

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 5 ways as a sum of consecutive naturals, for example, 27193489 + ... + 27194272.

Almost surely, 2^21320002312 is an apocalyptic number.

It is an amenable number.

21320002312 is an abundant number, since it is smaller than the sum of its proper divisors (25181534198).

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

21320002312 is a wasteful number, since it uses less digits than its factorization.

21320002312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54387781 (or 54387770 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

It can be divided in two parts, 2132000 and 2312, that added together give a palindrome (2134312).

The spelling of 21320002312 in words is "twenty-one billion, three hundred twenty million, two thousand, three hundred twelve".