4134121621 has 6 divisors (see below), whose sum is σ = 4809080310. Its totient is φ = 3543532776.

The previous prime is 4134121601. The next prime is 4134121627. The reversal of 4134121621 is 1261214314.

It can be written as a sum of positive squares in only one way, i.e., 3213302596 + 920819025 = 56686^2 + 30345^2 .

It is not a de Polignac number, because 4134121621 - 2⁷ = 4134121493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4134121627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42184866 + ... + 42184963.

It is an arithmetic number, because the mean of its divisors is an integer number (801513385).

Almost surely, 2^4134121621 is an apocalyptic number.

It is an amenable number.

4134121621 is a deficient number, since it is larger than the sum of its proper divisors (674958689).

4134121621 is an equidigital number, since it uses as much as digits as its factorization.

4134121621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84369843 (or 84369836 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 4134121621 is about 64297.1354027534. The cubic root of 4134121621 is about 1604.9484325911.

Adding to 4134121621 its reverse (1261214314), we get a palindrome (5395335935).

The spelling of 4134121621 in words is "four billion, one hundred thirty-four million, one hundred twenty-one thousand, six hundred twenty-one".