57489129821 has 2 divisors, whose sum is σ = 57489129822. Its totient is φ = 57489129820.

The previous prime is 57489129791. The next prime is 57489129833. The reversal of 57489129821 is 12892198475.

57489129821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48318194596 + 9170935225 = 219814^2 + 95765^2 .

It is a cyclic number.

It is not a de Polignac number, because 57489129821 - 2¹⁸ = 57488867677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57489129851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28744564910 + 28744564911.

It is an arithmetic number, because the mean of its divisors is an integer number (28744564911).

Almost surely, 2^57489129821 is an apocalyptic number.

It is an amenable number.

57489129821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57489129821 is an equidigital number, since it uses as much as digits as its factorization.

57489129821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 56.

The spelling of 57489129821 in words is "fifty-seven billion, four hundred eighty-nine million, one hundred twenty-nine thousand, eight hundred twenty-one".