201002100000221 has 4 divisors (see below), whose sum is σ = 216463800000252. Its totient is φ = 185540400000192.

The previous prime is 201002100000209. The next prime is 201002100000257. The reversal of 201002100000221 is 122000001200102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103630873005625 + 97371226994596 = 10179925^2 + 9867686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201002100000221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201002100000721) 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, 7730849999996 + ... + 7730850000021.

It is an arithmetic number, because the mean of its divisors is an integer number (54115950000063).

Almost surely, 2^{201002100000221} is an apocalyptic number.

It is an amenable number.

201002100000221 is a deficient number, since it is larger than the sum of its proper divisors (15461700000031).

201002100000221 is a wasteful number, since it uses less digits than its factorization.

201002100000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15461700000030.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201002100000221 its reverse (122000001200102), we get a palindrome (323002101200323).

The spelling of 201002100000221 in words is "two hundred one trillion, two billion, one hundred million, two hundred twenty-one", and thus it is an aban number.