57381729221 has 4 divisors (see below), whose sum is σ = 57406138944. Its totient is φ = 57357319500.

The previous prime is 57381729203. The next prime is 57381729241. The reversal of 57381729221 is 12292718375.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57381729221 - 2⁶ = 57381729157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57381729241) 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, 12201335 + ... + 12206036.

It is an arithmetic number, because the mean of its divisors is an integer number (14351534736).

Almost surely, 2^57381729221 is an apocalyptic number.

It is an amenable number.

57381729221 is a deficient number, since it is larger than the sum of its proper divisors (24409723).

57381729221 is a wasteful number, since it uses less digits than its factorization.

57381729221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24409722.

The product of its digits is 423360, while the sum is 47.

The spelling of 57381729221 in words is "fifty-seven billion, three hundred eighty-one million, seven hundred twenty-nine thousand, two hundred twenty-one".