20120110981 has 2 divisors, whose sum is σ = 20120110982. Its totient is φ = 20120110980.

The previous prime is 20120110979. The next prime is 20120111003. The reversal of 20120110981 is 18901102102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18547988481 + 1572122500 = 136191^2 + 39650^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120110981 - 2¹ = 20120110979 is a prime.

It is a super-2 number, since 2×20120110981² (a number of 21 digits) contains 22 as substring.

Together with 20120110979, 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 (20120110931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060055490 + 10060055491.

It is an arithmetic number, because the mean of its divisors is an integer number (10060055491).

Almost surely, 2^20120110981 is an apocalyptic number.

It is an amenable number.

20120110981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120110981 is an equidigital number, since it uses as much as digits as its factorization.

20120110981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 20120110981 in words is "twenty billion, one hundred twenty million, one hundred ten thousand, nine hundred eighty-one".