201221010202001 has 4 divisors (see below), whose sum is σ = 201223598564352. Its totient is φ = 201218421839652.

The previous prime is 201221010201989. The next prime is 201221010202039. The reversal of 201221010202001 is 100202010122102.

201221010202001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201221010202001 - 2³⁸ = 200946132295057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221010202301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294064561 + ... + 1294220046.

It is an arithmetic number, because the mean of its divisors is an integer number (50305899641088).

Almost surely, 2^{201221010202001} is an apocalyptic number.

It is an amenable number.

201221010202001 is a deficient number, since it is larger than the sum of its proper divisors (2588362351).

201221010202001 is an equidigital number, since it uses as much as digits as its factorization.

201221010202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588362350.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201221010202001 its reverse (100202010122102), we get a palindrome (301423020324103).

The spelling of 201221010202001 in words is "two hundred one trillion, two hundred twenty-one billion, ten million, two hundred two thousand, one".