540516213147721 has 2 divisors, whose sum is σ = 540516213147722. Its totient is φ = 540516213147720.

The previous prime is 540516213147709. The next prime is 540516213147769. The reversal of 540516213147721 is 127741312615045.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459433031803321 + 81083181344400 = 21434389^2 + 9004620^2 .

It is a cyclic number.

It is not a de Polignac number, because 540516213147721 - 2¹⁵ = 540516213114953 is a prime.

It is not a weakly prime, because it can be changed into another prime (540516213147221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270258106573860 + 270258106573861.

It is an arithmetic number, because the mean of its divisors is an integer number (270258106573861).

Almost surely, 2^{540516213147721} is an apocalyptic number.

It is an amenable number.

540516213147721 is a deficient number, since it is larger than the sum of its proper divisors (1).

540516213147721 is an equidigital number, since it uses as much as digits as its factorization.

540516213147721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 540516213147721 in words is "five hundred forty trillion, five hundred sixteen billion, two hundred thirteen million, one hundred forty-seven thousand, seven hundred twenty-one".