21028320000577 has 4 divisors (see below), whose sum is σ = 21281673253680. Its totient is φ = 20774966747476.

The previous prime is 21028320000557. The next prime is 21028320000601. The reversal of 21028320000577 is 77500002382012.

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 a de Polignac number, because none of the positive numbers 2^k-21028320000577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21028320000557) 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, 126676626427 + ... + 126676626592.

It is an arithmetic number, because the mean of its divisors is an integer number (5320418313420).

Almost surely, 2^{21028320000577} is an apocalyptic number.

It is an amenable number.

21028320000577 is a deficient number, since it is larger than the sum of its proper divisors (253353253103).

21028320000577 is an equidigital number, since it uses as much as digits as its factorization.

21028320000577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253353253102.

The product of its (nonzero) digits is 47040, while the sum is 37.

Adding to 21028320000577 its reverse (77500002382012), we get a palindrome (98528322382589).

The spelling of 21028320000577 in words is "twenty-one trillion, twenty-eight billion, three hundred twenty million, five hundred seventy-seven", and thus it is an aban number.