21010001020201 has 16 divisors (see below), whose sum is σ = 23416906023360. Its totient is φ = 18733226227200.

The previous prime is 21010001020199. The next prime is 21010001020249. The reversal of 21010001020201 is 10202010001012.

It is a cyclic number.

It is not a de Polignac number, because 21010001020201 - 2¹ = 21010001020199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010001000201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68642101 + ... + 68947501.

It is an arithmetic number, because the mean of its divisors is an integer number (1463556626460).

Almost surely, 2^{21010001020201} is an apocalyptic number.

It is an amenable number.

21010001020201 is a deficient number, since it is larger than the sum of its proper divisors (2406905003159).

21010001020201 is a wasteful number, since it uses less digits than its factorization.

21010001020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518424.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010001020201 its reverse (10202010001012), we get a palindrome (31212011021213).

The spelling of 21010001020201 in words is "twenty-one trillion, ten billion, one million, twenty thousand, two hundred one".