4505212121 has 4 divisors (see below), whose sum is σ = 4505374692. Its totient is φ = 4505049552.

The previous prime is 4505212111. The next prime is 4505212133. The reversal of 4505212121 is 1212125054.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3864362896 + 640849225 = 62164^2 + 25315^2 .

It is a cyclic number.

It is not a de Polignac number, because 4505212121 - 2¹⁰ = 4505211097 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4505212111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28130 + ... + 99003.

It is an arithmetic number, because the mean of its divisors is an integer number (1126343673).

Almost surely, 2^4505212121 is an apocalyptic number.

It is an amenable number.

4505212121 is a deficient number, since it is larger than the sum of its proper divisors (162571).

4505212121 is a wasteful number, since it uses less digits than its factorization.

4505212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162570.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 4505212121 is about 67120.8769385502. The cubic root of 4505212121 is about 1651.6007875629.

Adding to 4505212121 its reverse (1212125054), we get a palindrome (5717337175).

The spelling of 4505212121 in words is "four billion, five hundred five million, two hundred twelve thousand, one hundred twenty-one".