4257145653421 has 24 divisors (see below), whose sum is σ = 4434148048824. Its totient is φ = 4084201105920.

The previous prime is 4257145653389. The next prime is 4257145653457. The reversal of 4257145653421 is 1243565417524.

It can be written as a sum of positive squares in 4 ways, for example, as 2530838721321 + 1726306932100 = 1590861^2 + 1313890^2 .

It is not a de Polignac number, because 4257145653421 - 2⁵ = 4257145653389 is a prime.

It is a super-2 number, since 2×4257145653421² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4257145633421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132783225 + ... + 132815281.

It is an arithmetic number, because the mean of its divisors is an integer number (184756168701).

Almost surely, 2^{4257145653421} is an apocalyptic number.

It is an amenable number.

4257145653421 is a deficient number, since it is larger than the sum of its proper divisors (177002395403).

4257145653421 is an equidigital number, since it uses as much as digits as its factorization.

4257145653421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32781 (or 32698 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 49.

The spelling of 4257145653421 in words is "four trillion, two hundred fifty-seven billion, one hundred forty-five million, six hundred fifty-three thousand, four hundred twenty-one".