545121511032221 has 4 divisors (see below), whose sum is σ = 545122724660892. Its totient is φ = 545120297403552.

The previous prime is 545121511032211. The next prime is 545121511032227. The reversal of 545121511032221 is 122230115121545.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111843548023321 + 433277963008900 = 10575611^2 + 20815330^2 .

It is a cyclic number.

It is not a de Polignac number, because 545121511032221 - 2⁶ = 545121511032157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545121511032227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606140336 + ... + 607039001.

It is an arithmetic number, because the mean of its divisors is an integer number (136280681165223).

Almost surely, 2^{545121511032221} is an apocalyptic number.

It is an amenable number.

545121511032221 is a deficient number, since it is larger than the sum of its proper divisors (1213628671).

545121511032221 is a wasteful number, since it uses less digits than its factorization.

545121511032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213628670.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 545121511032221 its reverse (122230115121545), we get a palindrome (667351626153766).

The spelling of 545121511032221 in words is "five hundred forty-five trillion, one hundred twenty-one billion, five hundred eleven million, thirty-two thousand, two hundred twenty-one".