21103230012312 has 128 divisors (see below), whose sum is σ = 61716326284800. Its totient is φ = 5887443115008.

The previous prime is 21103230012311. The next prime is 21103230012329. The reversal of 21103230012312 is 21321003230112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103230012311) 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, 22873948 + ... + 23778644.

It is an arithmetic number, because the mean of its divisors is an integer number (482158799100).

Almost surely, 2^{21103230012312} 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 21103230012312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30858163142400).

21103230012312 is an abundant number, since it is smaller than the sum of its proper divisors (40613096272488).

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

21103230012312 is a wasteful number, since it uses less digits than its factorization.

21103230012312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907985 (or 907981 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21103230012312 its reverse (21321003230112), we get a palindrome (42424233242424).

The spelling of 21103230012312 in words is "twenty-one trillion, one hundred three billion, two hundred thirty million, twelve thousand, three hundred twelve".