20121012089 has 2 divisors, whose sum is σ = 20121012090. Its totient is φ = 20121012088.

The previous prime is 20121012073. The next prime is 20121012091. The reversal of 20121012089 is 98021012102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18333160000 + 1787852089 = 135400^2 + 42283^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121012089 - 2⁴ = 20121012073 is a prime.

Together with 20121012091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20121012889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060506044 + 10060506045.

It is an arithmetic number, because the mean of its divisors is an integer number (10060506045).

Almost surely, 2^20121012089 is an apocalyptic number.

It is an amenable number.

20121012089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121012089 is an equidigital number, since it uses as much as digits as its factorization.

20121012089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

It can be divided in two parts, 2012 and 1012089, that added together give a palindrome (1014101).

The spelling of 20121012089 in words is "twenty billion, one hundred twenty-one million, twelve thousand, eighty-nine".