20121797833 has 2 divisors, whose sum is σ = 20121797834. Its totient is φ = 20121797832.

The previous prime is 20121797777. The next prime is 20121797887. The reversal of 20121797833 is 33879712102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13408945209 + 6712852624 = 115797^2 + 81932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121797833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121797833.

It is not a weakly prime, because it can be changed into another prime (20121797893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060898916 + 10060898917.

It is an arithmetic number, because the mean of its divisors is an integer number (10060898917).

Almost surely, 2^20121797833 is an apocalyptic number.

It is an amenable number.

20121797833 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121797833 is an equidigital number, since it uses as much as digits as its factorization.

20121797833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 20121797833 in words is "twenty billion, one hundred twenty-one million, seven hundred ninety-seven thousand, eight hundred thirty-three".