988577911021 has 4 divisors (see below), whose sum is σ = 988579903392. Its totient is φ = 988575918652.

The previous prime is 988577910893. The next prime is 988577911063. The reversal of 988577911021 is 120119775889.

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 988577911021 - 2⁷ = 988577910893 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 (988577911081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405546 + ... + 1463428.

It is an arithmetic number, because the mean of its divisors is an integer number (247144975848).

Almost surely, 2^988577911021 is an apocalyptic number.

It is an amenable number.

988577911021 is a deficient number, since it is larger than the sum of its proper divisors (1992371).

988577911021 is a wasteful number, since it uses less digits than its factorization.

988577911021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992370.

The product of its (nonzero) digits is 2540160, while the sum is 58.

The spelling of 988577911021 in words is "nine hundred eighty-eight billion, five hundred seventy-seven million, nine hundred eleven thousand, twenty-one".