20001202212001 has 2 divisors, whose sum is σ = 20001202212002. Its totient is φ = 20001202212000.

The previous prime is 20001202211999. The next prime is 20001202212007. The reversal of 20001202212001 is 10021220210002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19545241000000 + 455961212001 = 4421000^2 + 675249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001202212001 - 2¹ = 20001202211999 is a prime.

Together with 20001202211999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20001202212007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000601106000 + 10000601106001.

It is an arithmetic number, because the mean of its divisors is an integer number (10000601106001).

Almost surely, 2^{20001202212001} is an apocalyptic number.

It is an amenable number.

20001202212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001202212001 is an equidigital number, since it uses as much as digits as its factorization.

20001202212001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20001202212001 its reverse (10021220210002), we get a palindrome (30022422422003).

The spelling of 20001202212001 in words is "twenty trillion, one billion, two hundred two million, two hundred twelve thousand, one".