2002012212821 has 2 divisors, whose sum is σ = 2002012212822. Its totient is φ = 2002012212820.

The previous prime is 2002012212803. The next prime is 2002012212857. The reversal of 2002012212821 is 1282122102002.

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., 1070428198225 + 931584014596 = 1034615^2 + 965186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002012212821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002012202821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001006106410 + 1001006106411.

It is an arithmetic number, because the mean of its divisors is an integer number (1001006106411).

Almost surely, 2^{2002012212821} is an apocalyptic number.

It is an amenable number.

2002012212821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002012212821 is an equidigital number, since it uses as much as digits as its factorization.

2002012212821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 2002012212821 its reverse (1282122102002), we get a palindrome (3284134314823).

The spelling of 2002012212821 in words is "two trillion, two billion, twelve million, two hundred twelve thousand, eight hundred twenty-one".