21000321320112 has 120 divisors (see below), whose sum is σ = 60147813293568. Its totient is φ = 6836257008000.

The previous prime is 21000321320089. The next prime is 21000321320117. The reversal of 21000321320112 is 21102312300012.

21000321320112 is a `hidden beast` number, since 2 + 10 + 0 + 0 + 321 + 320 + 1 + 12 = 666.

It is a super-2 number, since 2×21000321320112² (a number of 27 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 (21000321320117) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 40304937 + ... + 40822647.

Almost surely, 2^{21000321320112} 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 21000321320112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30073906646784).

21000321320112 is an abundant number, since it is smaller than the sum of its proper divisors (39147491973456).

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

21000321320112 is a wasteful number, since it uses less digits than its factorization.

21000321320112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524319 (or 524310 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21000321320112 its reverse (21102312300012), we get a palindrome (42102633620124).

The spelling of 21000321320112 in words is "twenty-one trillion, three hundred twenty-one million, three hundred twenty thousand, one hundred twelve".