20021211012001 has 2 divisors, whose sum is σ = 20021211012002. Its totient is φ = 20021211012000.

The previous prime is 20021211011999. The next prime is 20021211012031. The reversal of 20021211012001 is 10021011212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12044404955025 + 7976806056976 = 3470505^2 + 2824324^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021211012001 - 2¹ = 20021211011999 is a prime.

Together with 20021211011999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20021211012031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010605506000 + 10010605506001.

It is an arithmetic number, because the mean of its divisors is an integer number (10010605506001).

Almost surely, 2^{20021211012001} is an apocalyptic number.

It is an amenable number.

20021211012001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021211012001 is an equidigital number, since it uses as much as digits as its factorization.

20021211012001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021211012001 its reverse (10021011212002), we get a palindrome (30042222224003).

The spelling of 20021211012001 in words is "twenty trillion, twenty-one billion, two hundred eleven million, twelve thousand, one".