657222420021 has 8 divisors (see below), whose sum is σ = 914396410560. Its totient is φ = 419098354752.

The previous prime is 657222419999. The next prime is 657222420047. The reversal of 657222420021 is 120024222756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 657222420021 - 2⁶ = 657222419957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657222420221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4762481236 + ... + 4762481373.

It is an arithmetic number, because the mean of its divisors is an integer number (114299551320).

Almost surely, 2^657222420021 is an apocalyptic number.

It is an amenable number.

657222420021 is a deficient number, since it is larger than the sum of its proper divisors (257173990539).

657222420021 is a wasteful number, since it uses less digits than its factorization.

657222420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9524962635.

The product of its (nonzero) digits is 26880, while the sum is 33.

Adding to 657222420021 its reverse (120024222756), we get a palindrome (777246642777).

The spelling of 657222420021 in words is "six hundred fifty-seven billion, two hundred twenty-two million, four hundred twenty thousand, twenty-one".