511004422140221 has 2 divisors, whose sum is σ = 511004422140222. Its totient is φ = 511004422140220.

The previous prime is 511004422140133. The next prime is 511004422140259. The reversal of 511004422140221 is 122041224400115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317039889916996 + 193964532223225 = 17805614^2 + 13927115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511004422140221 is a prime.

It is a super-2 number, since 2×511004422140221² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511004422145221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255502211070110 + 255502211070111.

It is an arithmetic number, because the mean of its divisors is an integer number (255502211070111).

Almost surely, 2^{511004422140221} is an apocalyptic number.

It is an amenable number.

511004422140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

511004422140221 is an equidigital number, since it uses as much as digits as its factorization.

511004422140221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 29.

Adding to 511004422140221 its reverse (122041224400115), we get a palindrome (633045646540336).

The spelling of 511004422140221 in words is "five hundred eleven trillion, four billion, four hundred twenty-two million, one hundred forty thousand, two hundred twenty-one".