2001212012021 has 2 divisors, whose sum is σ = 2001212012022. Its totient is φ = 2001212012020.

The previous prime is 2001212012003. The next prime is 2001212012029. The reversal of 2001212012021 is 1202102121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1991728173796 + 9483838225 = 1411286^2 + 97385^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001212012021 - 2³⁸ = 1726334105077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001212011987 and 2001212012005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001212012029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000606006010 + 1000606006011.

It is an arithmetic number, because the mean of its divisors is an integer number (1000606006011).

Almost surely, 2^{2001212012021} is an apocalyptic number.

It is an amenable number.

2001212012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001212012021 is an equidigital number, since it uses as much as digits as its factorization.

2001212012021 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 14.

Adding to 2001212012021 its reverse (1202102121002), we get a palindrome (3203314133023).

The spelling of 2001212012021 in words is "two trillion, one billion, two hundred twelve million, twelve thousand, twenty-one".