45445042021 has 4 divisors (see below), whose sum is σ = 45645240672. Its totient is φ = 45244843372.

The previous prime is 45445041979. The next prime is 45445042037. The reversal of 45445042021 is 12024054454.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45445042021 - 2⁷ = 45445041893 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 (45445042051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100098985 + ... + 100099438.

It is an arithmetic number, because the mean of its divisors is an integer number (11411310168).

Almost surely, 2^45445042021 is an apocalyptic number.

It is an amenable number.

45445042021 is a deficient number, since it is larger than the sum of its proper divisors (200198651).

45445042021 is a wasteful number, since it uses less digits than its factorization.

45445042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200198650.

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 45445042021 its reverse (12024054454), we get a palindrome (57469096475).

The spelling of 45445042021 in words is "forty-five billion, four hundred forty-five million, forty-two thousand, twenty-one".