4400145121 has 4 divisors (see below), whose sum is σ = 4400289792. Its totient is φ = 4400000452.

The previous prime is 4400145097. The next prime is 4400145143. The reversal of 4400145121 is 1215410044.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4400145121 - 2¹⁹ = 4399620833 is a prime.

It is a super-2 number, since 2×4400145121² = 38722554171720209282, 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 = 4400145092 and 4400145101.

It is not an unprimeable number, because it can be changed into a prime (4400145221) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7105 + ... + 94078.

It is an arithmetic number, because the mean of its divisors is an integer number (1100072448).

Almost surely, 2^4400145121 is an apocalyptic number.

It is an amenable number.

4400145121 is a deficient number, since it is larger than the sum of its proper divisors (144671).

4400145121 is a wasteful number, since it uses less digits than its factorization.

4400145121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144670.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 4400145121 is about 66333.5896887844. The cubic root of 4400145121 is about 1638.6605562642.

Adding to 4400145121 its reverse (1215410044), we get a palindrome (5615555165).

The spelling of 4400145121 in words is "four billion, four hundred million, one hundred forty-five thousand, one hundred twenty-one".