21320202312 has 96 divisors (see below), whose sum is σ = 58386140280. Its totient is φ = 7027660800.

The previous prime is 21320202283. The next prime is 21320202317.

21320202312 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 21185966916 + 134235396 = 145554^2 + 11586^2 .

It is a super-2 number, since 2×21320202312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21320202317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8819728 + ... + 8822144.

Almost surely, 2^21320202312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320202312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29193070140).

21320202312 is an abundant number, since it is smaller than the sum of its proper divisors (37065937968).

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

21320202312 is a wasteful number, since it uses less digits than its factorization.

21320202312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743 (or 3736 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The spelling of 21320202312 in words is "twenty-one billion, three hundred twenty million, two hundred two thousand, three hundred twelve".