21303213111312 has 160 divisors (see below), whose sum is σ = 60256189357056. Its totient is φ = 6431889139200.

The previous prime is 21303213111311. The next prime is 21303213111403. The reversal of 21303213111312 is 21311131230312.

It is a super-2 number, since 2×21303213111312² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21303213111311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 721369987 + ... + 721399517.

Almost surely, 2^{21303213111312} is an apocalyptic number.

21303213111312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21303213111312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30128094678528).

21303213111312 is an abundant number, since it is smaller than the sum of its proper divisors (38952976245744).

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

21303213111312 is a wasteful number, since it uses less digits than its factorization.

21303213111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34509 (or 34503 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21303213111312 its reverse (21311131230312), we get a palindrome (42614344341624).

The spelling of 21303213111312 in words is "twenty-one trillion, three hundred three billion, two hundred thirteen million, one hundred eleven thousand, three hundred twelve".