21373602540244 has 12 divisors (see below), whose sum is σ = 37420752265344. Its totient is φ = 10681959035864.

The previous prime is 21373602540239. The next prime is 21373602540247. The reversal of 21373602540244 is 44204520637312.

It is a self number, because there is not a number n which added to its sum of digits gives 21373602540244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373602540247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210548634 + ... + 1210566289.

It is an arithmetic number, because the mean of its divisors is an integer number (3118396022112).

Almost surely, 2^{21373602540244} is an apocalyptic number.

It is an amenable number.

21373602540244 is a deficient number, since it is larger than the sum of its proper divisors (16047149725100).

21373602540244 is a wasteful number, since it uses less digits than its factorization.

21373602540244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421117134 (or 2421117132 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 43.

The spelling of 21373602540244 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred two million, five hundred forty thousand, two hundred forty-four".