45204021 has 16 divisors (see below), whose sum is σ = 70494400. Its totient is φ = 28549584.

The previous prime is 45203959. The next prime is 45204023. The reversal of 45204021 is 12040254.

It is not a de Polignac number, because 45204021 - 2⁶ = 45203957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45203985 and 45204003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45204023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43546 + ... + 44571.

It is an arithmetic number, because the mean of its divisors is an integer number (4405900).

Almost surely, 2^45204021 is an apocalyptic number.

It is an amenable number.

45204021 is a deficient number, since it is larger than the sum of its proper divisors (25290379).

45204021 is a wasteful number, since it uses less digits than its factorization.

45204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88145 (or 88139 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 45204021 is about 6723.3935627777. The cubic root of 45204021 is about 356.2260615494.

Adding to 45204021 its reverse (12040254), we get a palindrome (57244275).

It can be divided in two parts, 4 and 5204021, that added together give a palindrome (5204025).

The spelling of 45204021 in words is "forty-five million, two hundred four thousand, twenty-one".