89128936021 has 2 divisors, whose sum is σ = 89128936022. Its totient is φ = 89128936020.

The previous prime is 89128936019. The next prime is 89128936033. The reversal of 89128936021 is 12063982198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64765160100 + 24363775921 = 254490^2 + 156089^2 .

It is a cyclic number.

It is not a de Polignac number, because 89128936021 - 2¹ = 89128936019 is a prime.

It is a super-2 number, since 2×89128936021² (a number of 23 digits) contains 22 as substring.

Together with 89128936019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89128930021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44564468010 + 44564468011.

It is an arithmetic number, because the mean of its divisors is an integer number (44564468011).

Almost surely, 2^89128936021 is an apocalyptic number.

It is an amenable number.

89128936021 is a deficient number, since it is larger than the sum of its proper divisors (1).

89128936021 is an equidigital number, since it uses as much as digits as its factorization.

89128936021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 89128936021 in words is "eighty-nine billion, one hundred twenty-eight million, nine hundred thirty-six thousand, twenty-one".