20001212020997 has 2 divisors, whose sum is σ = 20001212020998. Its totient is φ = 20001212020996.

The previous prime is 20001212020981. The next prime is 20001212021023. The reversal of 20001212020997 is 79902021210002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18898373895076 + 1102838125921 = 4347226^2 + 1050161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001212020997 - 2⁴ = 20001212020981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001212022997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000606010498 + 10000606010499.

It is an arithmetic number, because the mean of its divisors is an integer number (10000606010499).

Almost surely, 2^{20001212020997} is an apocalyptic number.

It is an amenable number.

20001212020997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001212020997 is an equidigital number, since it uses as much as digits as its factorization.

20001212020997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

Adding to 20001212020997 its reverse (79902021210002), we get a palindrome (99903233230999).

The spelling of 20001212020997 in words is "twenty trillion, one billion, two hundred twelve million, twenty thousand, nine hundred ninety-seven".