21112220230312 has 8 divisors (see below), whose sum is σ = 39585412931850. Its totient is φ = 10556110115152.

The previous prime is 21112220230291. The next prime is 21112220230327. The reversal of 21112220230312 is 21303202221112.

It can be written as a sum of positive squares in only one way, i.e., 11420168631876 + 9692051598436 = 3379374^2 + 3113206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319513764387 + ... + 1319513764402.

Almost surely, 2^{21112220230312} is an apocalyptic number.

It is an amenable number.

21112220230312 is a deficient number, since it is larger than the sum of its proper divisors (18473192701538).

21112220230312 is a wasteful number, since it uses less digits than its factorization.

21112220230312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639027528795 (or 2639027528791 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21112220230312 its reverse (21303202221112), we get a palindrome (42415422451424).

The spelling of 21112220230312 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, two hundred thirty thousand, three hundred twelve".