20200001210021 has 2 divisors, whose sum is σ = 20200001210022. Its totient is φ = 20200001210020.

The previous prime is 20200001209987. The next prime is 20200001210057. The reversal of 20200001210021 is 12001210000202.

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., 17056156608100 + 3143844601921 = 4129910^2 + 1773089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200001210021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200001209984 and 20200001210011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200001210621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100000605010 + 10100000605011.

It is an arithmetic number, because the mean of its divisors is an integer number (10100000605011).

Almost surely, 2^{20200001210021} is an apocalyptic number.

It is an amenable number.

20200001210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200001210021 is an equidigital number, since it uses as much as digits as its factorization.

20200001210021 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 11.

Adding to 20200001210021 its reverse (12001210000202), we get a palindrome (32201211210223).

The spelling of 20200001210021 in words is "twenty trillion, two hundred billion, one million, two hundred ten thousand, twenty-one".