20002021121009 has 2 divisors, whose sum is σ = 20002021121010. Its totient is φ = 20002021121008.

The previous prime is 20002021120987. The next prime is 20002021121057. The reversal of 20002021121009 is 90012112020002.

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., 17256879139600 + 2745141981409 = 4154140^2 + 1656847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002021121009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20002021127009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001010560504 + 10001010560505.

It is an arithmetic number, because the mean of its divisors is an integer number (10001010560505).

Almost surely, 2^{20002021121009} is an apocalyptic number.

It is an amenable number.

20002021121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002021121009 is an equidigital number, since it uses as much as digits as its factorization.

20002021121009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 20002021121009 in words is "twenty trillion, two billion, twenty-one million, one hundred twenty-one thousand, nine".