20002001210977 has 2 divisors, whose sum is σ = 20002001210978. Its totient is φ = 20002001210976.

The previous prime is 20002001210899. The next prime is 20002001211001. The reversal of 20002001210977 is 77901210020002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15604072139601 + 4397929071376 = 3950199^2 + 2097124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002001210977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20002001210377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001000605488 + 10001000605489.

It is an arithmetic number, because the mean of its divisors is an integer number (10001000605489).

Almost surely, 2^{20002001210977} is an apocalyptic number.

It is an amenable number.

20002001210977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002001210977 is an equidigital number, since it uses as much as digits as its factorization.

20002001210977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

Adding to 20002001210977 its reverse (77901210020002), we get a palindrome (97903211230979).

The spelling of 20002001210977 in words is "twenty trillion, two billion, one million, two hundred ten thousand, nine hundred seventy-seven".