4401212121 has 12 divisors (see below), whose sum is σ = 6444393748. Its totient is φ = 2893947264.

The previous prime is 4401212107. The next prime is 4401212141. The reversal of 4401212121 is 1212121044.

4401212121 is a `hidden beast` number, since 440 + 1 + 212 + 12 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3448625625 + 952586496 = 58725^2 + 30864^2 .

It is not a de Polignac number, because 4401212121 - 2⁵ = 4401212089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4401212094 and 4401212103.

It is not an unprimeable number, because it can be changed into a prime (4401212141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3348820 + ... + 3350133.

Almost surely, 2^4401212121 is an apocalyptic number.

It is an amenable number.

4401212121 is a deficient number, since it is larger than the sum of its proper divisors (2043181627).

4401212121 is a wasteful number, since it uses less digits than its factorization.

4401212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6699032 (or 6699029 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 4401212121 is about 66341.6318837576. The cubic root of 4401212121 is about 1638.7929995856.

Adding to 4401212121 its reverse (1212121044), we get a palindrome (5613333165).

The spelling of 4401212121 in words is "four billion, four hundred one million, two hundred twelve thousand, one hundred twenty-one".