21230103312 has 240 divisors, whose sum is σ = 68868895680. Its totient is φ = 6043161600.

The previous prime is 21230103299. The next prime is 21230103337. The reversal of 21230103312 is 21330103212.

21230103312 is a `hidden beast` number, since 21 + 230 + 103 + 312 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1693387 + ... + 1705877.

It is an arithmetic number, because the mean of its divisors is an integer number (286953732).

Almost surely, 2^21230103312 is an apocalyptic number.

21230103312 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 21230103312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34434447840).

21230103312 is an abundant number, since it is smaller than the sum of its proper divisors (47638792368).

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

21230103312 is a wasteful number, since it uses less digits than its factorization.

21230103312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12582 (or 12573 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21230103312 its reverse (21330103212), we get a palindrome (42560206524).

The spelling of 21230103312 in words is "twenty-one billion, two hundred thirty million, one hundred three thousand, three hundred twelve".