4521959421 has 64 divisors (see below), whose sum is σ = 7538116608. Its totient is φ = 2352365568.

The previous prime is 4521959389. The next prime is 4521959423. The reversal of 4521959421 is 1249591254.

It is not a de Polignac number, because 4521959421 - 2⁵ = 4521959389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4521959423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1641181 + ... + 1643933.

It is an arithmetic number, because the mean of its divisors is an integer number (117783072).

Almost surely, 2^4521959421 is an apocalyptic number.

It is an amenable number.

4521959421 is a deficient number, since it is larger than the sum of its proper divisors (3016157187).

4521959421 is a wasteful number, since it uses less digits than its factorization.

4521959421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930.

The product of its digits is 129600, while the sum is 42.

The square root of 4521959421 is about 67245.5159917745. The cubic root of 4521959421 is about 1653.6447646465.

The spelling of 4521959421 in words is "four billion, five hundred twenty-one million, nine hundred fifty-nine thousand, four hundred twenty-one".