540041520321221 has 2 divisors, whose sum is σ = 540041520321222. Its totient is φ = 540041520321220.

The previous prime is 540041520321197. The next prime is 540041520321253. The reversal of 540041520321221 is 122123025140045.

It is an a-pointer prime, because the next prime (540041520321253) can be obtained adding 540041520321221 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 463312925337025 + 76728594984196 = 21524705^2 + 8759486^2 .

It is a cyclic number.

It is not a de Polignac number, because 540041520321221 - 2¹⁴ = 540041520304837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (540041520321421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270020760160610 + 270020760160611.

It is an arithmetic number, because the mean of its divisors is an integer number (270020760160611).

Almost surely, 2^{540041520321221} is an apocalyptic number.

It is an amenable number.

540041520321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

540041520321221 is an equidigital number, since it uses as much as digits as its factorization.

540041520321221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 540041520321221 its reverse (122123025140045), we get a palindrome (662164545461266).

The spelling of 540041520321221 in words is "five hundred forty trillion, forty-one billion, five hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".