21180458573 has 2 divisors, whose sum is σ = 21180458574. Its totient is φ = 21180458572.

The previous prime is 21180458543. The next prime is 21180458581. The reversal of 21180458573 is 37585408112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15045966244 + 6134492329 = 122662^2 + 78323^2 .

It is a cyclic number.

It is not a de Polignac number, because 21180458573 - 2²⁰ = 21179409997 is a prime.

It is a super-2 number, since 2×21180458573² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21180458513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10590229286 + 10590229287.

It is an arithmetic number, because the mean of its divisors is an integer number (10590229287).

Almost surely, 2^21180458573 is an apocalyptic number.

It is an amenable number.

21180458573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21180458573 is an equidigital number, since it uses as much as digits as its factorization.

21180458573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 21180458573 in words is "twenty-one billion, one hundred eighty million, four hundred fifty-eight thousand, five hundred seventy-three".