21483771933481 has 27 divisors (see below), whose sum is σ = 25571404851237. Its totient is φ = 18027783876960.

The previous prime is 21483771933439. The next prime is 21483771933521. The reversal of 21483771933481 is 18433917738412.

The square root of 21483771933481 is 4635059.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 188131255081 + 21295640678400 = 433741^2 + 4614720^2 .

It is not a de Polignac number, because 21483771933481 - 2²¹ = 21483769836329 is a prime.

It is a super-2 number, since 2×21483771933481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21483771933401) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 662797231 + ... + 662829643.

Almost surely, 2^{21483771933481} is an apocalyptic number.

21483771933481 is the 4635059-th square number.

21483771933481 is the 2317530-th centered octagonal number.

It is an amenable number.

21483771933481 is a deficient number, since it is larger than the sum of its proper divisors (4087632917756).

21483771933481 is an frugal number, since it uses more digits than its factorization.

21483771933481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64874 (or 32437 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The spelling of 21483771933481 in words is "twenty-one trillion, four hundred eighty-three billion, seven hundred seventy-one million, nine hundred thirty-three thousand, four hundred eighty-one".