4001043121 has 2 divisors, whose sum is σ = 4001043122. Its totient is φ = 4001043120.

The previous prime is 4001043113. The next prime is 4001043139. The reversal of 4001043121 is 1213401004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3898628721 + 102414400 = 62439^2 + 10120^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001043121 - 2³ = 4001043113 is a prime.

It is a super-2 number, since 2×4001043121² = 32016692112202841282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 4001043095 and 4001043104.

It is not a weakly prime, because it can be changed into another prime (4001043521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000521560 + 2000521561.

It is an arithmetic number, because the mean of its divisors is an integer number (2000521561).

Almost surely, 2^4001043121 is an apocalyptic number.

It is an amenable number.

4001043121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001043121 is an equidigital number, since it uses as much as digits as its factorization.

4001043121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 4001043121 is about 63253.7992613882. The cubic root of 4001043121 is about 1587.5390275895.

Adding to 4001043121 its reverse (1213401004), we get a palindrome (5214444125).

It can be divided in two parts, 400104 and 3121, that added together give a square (403225 = 635²).

The spelling of 4001043121 in words is "four billion, one million, forty-three thousand, one hundred twenty-one".