20121001010989 has 2 divisors, whose sum is σ = 20121001010990. Its totient is φ = 20121001010988.

The previous prime is 20121001010987. The next prime is 20121001011043. The reversal of 20121001010989 is 98901010012102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13970154602889 + 6150846408100 = 3737667^2 + 2480090^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121001010989 - 2¹ = 20121001010987 is a prime.

Together with 20121001010987, 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 (20121001010987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060500505494 + 10060500505495.

It is an arithmetic number, because the mean of its divisors is an integer number (10060500505495).

Almost surely, 2^{20121001010989} is an apocalyptic number.

It is an amenable number.

20121001010989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121001010989 is an equidigital number, since it uses as much as digits as its factorization.

20121001010989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 20121001010989 in words is "twenty trillion, one hundred twenty-one billion, one million, ten thousand, nine hundred eighty-nine".