20121332989 has 2 divisors, whose sum is σ = 20121332990. Its totient is φ = 20121332988.

The previous prime is 20121332983. The next prime is 20121333053. The reversal of 20121332989 is 98923312102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20093062500 + 28270489 = 141750^2 + 5317^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121332989 - 2³ = 20121332981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121332981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060666494 + 10060666495.

It is an arithmetic number, because the mean of its divisors is an integer number (10060666495).

Almost surely, 2^20121332989 is an apocalyptic number.

It is an amenable number.

20121332989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121332989 is an equidigital number, since it uses as much as digits as its factorization.

20121332989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 20121332989 in words is "twenty billion, one hundred twenty-one million, three hundred thirty-two thousand, nine hundred eighty-nine".