4405123310921 has 2 divisors, whose sum is σ = 4405123310922. Its totient is φ = 4405123310920.

The previous prime is 4405123310881. The next prime is 4405123310953. The reversal of 4405123310921 is 1290133215044.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4347204150025 + 57919160896 = 2084995^2 + 240664^2 .

It is a cyclic number.

It is not a de Polignac number, because 4405123310921 - 2⁴² = 7076799817 is a prime.

It is a super-2 number, since 2×4405123310921² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4405123310221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2202561655460 + 2202561655461.

It is an arithmetic number, because the mean of its divisors is an integer number (2202561655461).

Almost surely, 2^{4405123310921} is an apocalyptic number.

It is an amenable number.

4405123310921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4405123310921 is an equidigital number, since it uses as much as digits as its factorization.

4405123310921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 4405123310921 its reverse (1290133215044), we get a palindrome (5695256525965).

The spelling of 4405123310921 in words is "four trillion, four hundred five billion, one hundred twenty-three million, three hundred ten thousand, nine hundred twenty-one".