445542011213221 has 4 divisors (see below), whose sum is σ = 479814473614252. Its totient is φ = 411269548812192.

The previous prime is 445542011213153. The next prime is 445542011213231. The reversal of 445542011213221 is 122312110245544.

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 301962040473025 + 143579970740196 = 17377055^2 + 11982486^2 .

It is a cyclic number.

It is not a de Polignac number, because 445542011213221 - 2⁷ = 445542011213093 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 (445542011213231) 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, 17136231200496 + ... + 17136231200521.

It is an arithmetic number, because the mean of its divisors is an integer number (119953618403563).

Almost surely, 2^{445542011213221} is an apocalyptic number.

It is an amenable number.

445542011213221 is a deficient number, since it is larger than the sum of its proper divisors (34272462401031).

445542011213221 is a wasteful number, since it uses less digits than its factorization.

445542011213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34272462401030.

The product of its (nonzero) digits is 76800, while the sum is 37.

Adding to 445542011213221 its reverse (122312110245544), we get a palindrome (567854121458765).

The spelling of 445542011213221 in words is "four hundred forty-five trillion, five hundred forty-two billion, eleven million, two hundred thirteen thousand, two hundred twenty-one".