1000201000021 has 2 divisors, whose sum is σ = 1000201000022. Its totient is φ = 1000201000020.

The previous prime is 1000201000009. The next prime is 1000201000037. The reversal of 1000201000021 is 1200001020001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988212939921 + 11988060100 = 994089^2 + 109490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000201000021 - 2⁵ = 1000200999989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000200999968 and 1000201000013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000201000091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500100500010 + 500100500011.

It is an arithmetic number, because the mean of its divisors is an integer number (500100500011).

Almost surely, 2^{1000201000021} is an apocalyptic number.

It is an amenable number.

1000201000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000201000021 is an equidigital number, since it uses as much as digits as its factorization.

1000201000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1000201000021 its reverse (1200001020001), we get a palindrome (2200202020022).

The spelling of 1000201000021 in words is "one trillion, two hundred one million, twenty-one", and thus it is an aban number.