200020012120021 has 2 divisors, whose sum is σ = 200020012120022. Its totient is φ = 200020012120020.

The previous prime is 200020012119959. The next prime is 200020012120063. The reversal of 200020012120021 is 120021210020002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172883841160900 + 27136170959121 = 13148530^2 + 5209239^2 .

It is a cyclic number.

It is not a de Polignac number, because 200020012120021 - 2¹¹ = 200020012117973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200020012119983 and 200020012120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200020013120021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010006060010 + 100010006060011.

It is an arithmetic number, because the mean of its divisors is an integer number (100010006060011).

Almost surely, 2^{200020012120021} is an apocalyptic number.

It is an amenable number.

200020012120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200020012120021 is an equidigital number, since it uses as much as digits as its factorization.

200020012120021 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 200020012120021 its reverse (120021210020002), we get a palindrome (320041222140023).

The spelling of 200020012120021 in words is "two hundred trillion, twenty billion, twelve million, one hundred twenty thousand, twenty-one".