21044020312312 has 16 divisors (see below), whose sum is σ = 39465705729600. Its totient is φ = 10519832117760.

The previous prime is 21044020312247. The next prime is 21044020312339. The reversal of 21044020312312 is 21321302044012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272213737 + ... + 272291032.

It is an arithmetic number, because the mean of its divisors is an integer number (2466606608100).

Almost surely, 2^{21044020312312} is an apocalyptic number.

It is an amenable number.

21044020312312 is a deficient number, since it is larger than the sum of its proper divisors (18421685417288).

21044020312312 is a wasteful number, since it uses less digits than its factorization.

21044020312312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544509606 (or 544509602 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21044020312312 its reverse (21321302044012), we get a palindrome (42365322356324).

The spelling of 21044020312312 in words is "twenty-one trillion, forty-four billion, twenty million, three hundred twelve thousand, three hundred twelve".