21080426481 has 9 divisors (see below), whose sum is σ = 30450134091. Its totient is φ = 14053327272.

The previous prime is 21080426449. The next prime is 21080426491. The reversal of 21080426481 is 18462408012.

The square root of 21080426481 is 145191.

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

21080426481 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 0 + 4 + 2 + 648 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16792272225 + 4288154256 = 129585^2 + 65484^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 21080426481 - 2⁵ = 21080426449 is a prime.

It is a super-2 number, since 2×21080426481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21080426491) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 411375 + ... + 459771.

Almost surely, 2^21080426481 is an apocalyptic number.

21080426481 is the 145191-st square number.

21080426481 is the 72596-th centered octagonal number.

It is an amenable number.

21080426481 is a deficient number, since it is larger than the sum of its proper divisors (9369707610).

21080426481 is an frugal number, since it uses more digits than its factorization.

21080426481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96800 (or 48400 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

Multiplying 21080426481 by its sum of digits (36), we get a square (758895353316 = 871146²).

It can be divided in two parts, 21080 and 426481, that added together give a square (447561 = 669²).

The spelling of 21080426481 in words is "twenty-one billion, eighty million, four hundred twenty-six thousand, four hundred eighty-one".