45450042021 has 6 divisors (see below), whose sum is σ = 65650060710. Its totient is φ = 30300028008.

The previous prime is 45450041953. The next prime is 45450042023. The reversal of 45450042021 is 12024005454.

45450042021 is a `hidden beast` number, since 4 + 5 + 450 + 0 + 4 + 202 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35862890625 + 9587151396 = 189375^2 + 97914^2 .

It is not a de Polignac number, because 45450042021 - 2¹³ = 45450033829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45450042023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2525002326 + ... + 2525002343.

It is an arithmetic number, because the mean of its divisors is an integer number (10941676785).

Almost surely, 2^45450042021 is an apocalyptic number.

It is an amenable number.

45450042021 is a deficient number, since it is larger than the sum of its proper divisors (20200018689).

45450042021 is a wasteful number, since it uses less digits than its factorization.

45450042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050004675 (or 5050004672 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 45450042021 its reverse (12024005454), we get a palindrome (57474047475).

The spelling of 45450042021 in words is "forty-five billion, four hundred fifty million, forty-two thousand, twenty-one".