545021312221 has 2 divisors, whose sum is σ = 545021312222. Its totient is φ = 545021312220.

The previous prime is 545021312207. The next prime is 545021312309. The reversal of 545021312221 is 122213120545.

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., 469869120900 + 75152191321 = 685470^2 + 274139^2 .

It is a cyclic number.

It is not a de Polignac number, because 545021312221 - 2²⁵ = 544987757789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 545021312221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545021312201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272510656110 + 272510656111.

It is an arithmetic number, because the mean of its divisors is an integer number (272510656111).

Almost surely, 2^545021312221 is an apocalyptic number.

It is an amenable number.

545021312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

545021312221 is an equidigital number, since it uses as much as digits as its factorization.

545021312221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 545021312221 its reverse (122213120545), we get a palindrome (667234432766).

The spelling of 545021312221 in words is "five hundred forty-five billion, twenty-one million, three hundred twelve thousand, two hundred twenty-one".