4125621521 has 8 divisors (see below), whose sum is σ = 4720491840. Its totient is φ = 3532125168.

The previous prime is 4125621517. The next prime is 4125621529. The reversal of 4125621521 is 1251265214.

4125621521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4125621521 - 2² = 4125621517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4125621529) 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, 337046 + ... + 349071.

It is an arithmetic number, because the mean of its divisors is an integer number (590061480).

Almost surely, 2^4125621521 is an apocalyptic number.

It is an amenable number.

4125621521 is a deficient number, since it is larger than the sum of its proper divisors (594870319).

4125621521 is an equidigital number, since it uses as much as digits as its factorization.

4125621521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686983.

The product of its digits is 4800, while the sum is 29.

The square root of 4125621521 is about 64231.0012455045. The cubic root of 4125621521 is about 1603.8477084253.

Adding to 4125621521 its reverse (1251265214), we get a palindrome (5376886735).

The spelling of 4125621521 in words is "four billion, one hundred twenty-five million, six hundred twenty-one thousand, five hundred twenty-one".