45121220 has 24 divisors (see below), whose sum is σ = 95823000. Its totient is φ = 17844992.

The previous prime is 45121211. The next prime is 45121231. The reversal of 45121220 is 2212154.

45121220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 391876 + 44729344 = 626^2 + 6688^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10895 + ... + 14454.

It is an arithmetic number, because the mean of its divisors is an integer number (3992625).

Almost surely, 2^45121220 is an apocalyptic number.

It is an amenable number.

45121220 is an abundant number, since it is smaller than the sum of its proper divisors (50701780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

45121220 is a wasteful number, since it uses less digits than its factorization.

45121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25447 (or 25445 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 45121220 is about 6717.2330613133. The cubic root of 45121220 is about 356.0084267668.

Adding to 45121220 its reverse (2212154), we get a palindrome (47333374).

The spelling of 45121220 in words is "forty-five million, one hundred twenty-one thousand, two hundred twenty".