57120421 has 4 divisors (see below), whose sum is σ = 58513644. Its totient is φ = 55727200.

The previous prime is 57120419. The next prime is 57120439. The reversal of 57120421 is 12402175.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 38750625 = 4286^2 + 6225^2 .

It is not a de Polignac number, because 57120421 - 2¹ = 57120419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57120392 and 57120401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57124421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696550 + ... + 696631.

It is an arithmetic number, because the mean of its divisors is an integer number (14628411).

Almost surely, 2^57120421 is an apocalyptic number.

It is an amenable number.

57120421 is a deficient number, since it is larger than the sum of its proper divisors (1393223).

57120421 is a wasteful number, since it uses less digits than its factorization.

57120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393222.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 57120421 is about 7557.8053031287. The cubic root of 57120421 is about 385.1209402475.

Adding to 57120421 its reverse (12402175), we get a palindrome (69522596).

The spelling of 57120421 in words is "fifty-seven million, one hundred twenty thousand, four hundred twenty-one".