20001212012149 has 2 divisors, whose sum is σ = 20001212012150. Its totient is φ = 20001212012148.

The previous prime is 20001212012113. The next prime is 20001212012209. The reversal of 20001212012149 is 94121021210002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19374241017924 + 626970994225 = 4401618^2 + 791815^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001212012149 - 2⁹ = 20001212011637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001212082149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000606006074 + 10000606006075.

It is an arithmetic number, because the mean of its divisors is an integer number (10000606006075).

Almost surely, 2^{20001212012149} is an apocalyptic number.

It is an amenable number.

20001212012149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001212012149 is an equidigital number, since it uses as much as digits as its factorization.

20001212012149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 20001212012149 in words is "twenty trillion, one billion, two hundred twelve million, twelve thousand, one hundred forty-nine".