21220043326312 has 8 divisors (see below), whose sum is σ = 39787581236850. Its totient is φ = 10610021663152.

The previous prime is 21220043326253. The next prime is 21220043326319. The reversal of 21220043326312 is 21362334002212.

It can be written as a sum of positive squares in only one way, i.e., 20698623581476 + 521419744836 = 4549574^2 + 722094^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21220043326319) by changing a digit.

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, 1326252707887 + ... + 1326252707902.

Almost surely, 2^{21220043326312} is an apocalyptic number.

It is an amenable number.

21220043326312 is a deficient number, since it is larger than the sum of its proper divisors (18567537910538).

21220043326312 is a wasteful number, since it uses less digits than its factorization.

21220043326312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652505415795 (or 2652505415791 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21220043326312 its reverse (21362334002212), we get a palindrome (42582377328524).

The spelling of 21220043326312 in words is "twenty-one trillion, two hundred twenty billion, forty-three million, three hundred twenty-six thousand, three hundred twelve".