45051021 has 6 divisors (see below), whose sum is σ = 65073710. Its totient is φ = 30034008.

The previous prime is 45051011. The next prime is 45051047. The reversal of 45051021 is 12015054.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 16695396 = 5325^2 + 4086^2 .

It is not a de Polignac number, because 45051021 - 2⁷ = 45050893 is a prime.

It is a super-3 number, since 3×45051021³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45050985 and 45051003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45051011) 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, 2502826 + ... + 2502843.

Almost surely, 2^45051021 is an apocalyptic number.

It is an amenable number.

45051021 is a deficient number, since it is larger than the sum of its proper divisors (20022689).

45051021 is a wasteful number, since it uses less digits than its factorization.

45051021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5005675 (or 5005672 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 45051021 is about 6712.0057359928. The cubic root of 45051021 is about 355.8237065309.

Adding to 45051021 its reverse (12015054), we get a palindrome (57066075).

The spelling of 45051021 in words is "forty-five million, fifty-one thousand, twenty-one".