45121204511221 has 8 divisors (see below), whose sum is σ = 45568461958488. Its totient is φ = 44673957120000.

The previous prime is 45121204511209. The next prime is 45121204511269. The reversal of 45121204511221 is 12211540212154.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16386190656196 + 28735013855025 = 4047986^2 + 5360505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45121204511221 - 2¹⁷ = 45121204380149 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 (45121204511291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6669861 + ... + 11607301.

It is an arithmetic number, because the mean of its divisors is an integer number (5696057744811).

Almost surely, 2^{45121204511221} is an apocalyptic number.

It is an amenable number.

45121204511221 is a deficient number, since it is larger than the sum of its proper divisors (447257447267).

45121204511221 is a wasteful number, since it uses less digits than its factorization.

45121204511221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028023.

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 45121204511221 its reverse (12211540212154), we get a palindrome (57332744723375).

The spelling of 45121204511221 in words is "forty-five trillion, one hundred twenty-one billion, two hundred four million, five hundred eleven thousand, two hundred twenty-one".