21753120280181 has 2 divisors, whose sum is σ = 21753120280182. Its totient is φ = 21753120280180.

The previous prime is 21753120280117. The next prime is 21753120280301. The reversal of 21753120280181 is 18108202135712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21732994601956 + 20125678225 = 4661866^2 + 141865^2 .

It is a cyclic number.

It is not a de Polignac number, because 21753120280181 - 2⁶ = 21753120280117 is a prime.

It is a super-2 number, since 2×21753120280181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21753140280181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876560140090 + 10876560140091.

It is an arithmetic number, because the mean of its divisors is an integer number (10876560140091).

Almost surely, 2^{21753120280181} is an apocalyptic number.

It is an amenable number.

21753120280181 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753120280181 is an equidigital number, since it uses as much as digits as its factorization.

21753120280181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 21753120280181 in words is "twenty-one trillion, seven hundred fifty-three billion, one hundred twenty million, two hundred eighty thousand, one hundred eighty-one".