21373472761443 has 12 divisors (see below), whose sum is σ = 33679411624248. Its totient is φ = 12953619855360.

The previous prime is 21373472761409. The next prime is 21373472761457. The reversal of 21373472761443 is 34416727437312.

21373472761443 is a `hidden beast` number, since 2 + 1 + 3 + 73 + 4 + 72 + 7 + 61 + 443 = 666.

It is not a de Polignac number, because 21373472761443 - 2¹² = 21373472757347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21373472761443.

It is not an unprimeable number, because it can be changed into a prime (21373472261443) 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 in 11 ways as a sum of consecutive naturals, for example, 107946832030 + ... + 107946832227.

It is an arithmetic number, because the mean of its divisors is an integer number (2806617635354).

Almost surely, 2^{21373472761443} is an apocalyptic number.

21373472761443 is a deficient number, since it is larger than the sum of its proper divisors (12305938862805).

21373472761443 is a wasteful number, since it uses less digits than its factorization.

21373472761443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215893664274 (or 215893664271 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 54.

The spelling of 21373472761443 in words is "twenty-one trillion, three hundred seventy-three billion, four hundred seventy-two million, seven hundred sixty-one thousand, four hundred forty-three".