4120212121 has 8 divisors (see below), whose sum is σ = 4201155464. Its totient is φ = 4039701120.

The previous prime is 4120212113. The next prime is 4120212127. The reversal of 4120212121 is 1212120214.

It can be written as a sum of positive squares in 4 ways, for example, as 145540096 + 3974672025 = 12064^2 + 63045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4120212121 - 2³ = 4120212113 is a prime.

It is a super-2 number, since 2×4120212121² = 33952295844070637282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4120212095 and 4120212104.

It is not an unprimeable number, because it can be changed into a prime (4120212127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88806 + ... + 126991.

It is an arithmetic number, because the mean of its divisors is an integer number (525144433).

Almost surely, 2^4120212121 is an apocalyptic number.

It is an amenable number.

4120212121 is a deficient number, since it is larger than the sum of its proper divisors (80943343).

4120212121 is a wasteful number, since it uses less digits than its factorization.

4120212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216171.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 4120212121 is about 64188.8784837374. The cubic root of 4120212121 is about 1603.1464283588.

Adding to 4120212121 its reverse (1212120214), we get a palindrome (5332332335).

The spelling of 4120212121 in words is "four billion, one hundred twenty million, two hundred twelve thousand, one hundred twenty-one".