21753140280181 has 2 divisors, whose sum is σ = 21753140280182. Its totient is φ = 21753140280180.

The previous prime is 21753140280161. The next prime is 21753140280253. The reversal of 21753140280181 is 18108204135712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21627466485156 + 125673795025 = 4650534^2 + 354505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21753140280181 - 2⁵ = 21753140280149 is a prime.

It is a super-2 number, since 2×21753140280181² (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 (21753140280161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876570140090 + 10876570140091.

It is an arithmetic number, because the mean of its divisors is an integer number (10876570140091).

Almost surely, 2^{21753140280181} is an apocalyptic number.

It is an amenable number.

21753140280181 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753140280181 is an equidigital number, since it uses as much as digits as its factorization.

21753140280181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 21753140280181 in words is "twenty-one trillion, seven hundred fifty-three billion, one hundred forty million, two hundred eighty thousand, one hundred eighty-one".