20110221010001 has 4 divisors (see below), whose sum is σ = 20111252270004. Its totient is φ = 20109189750000.

The previous prime is 20110221009961. The next prime is 20110221010067. The reversal of 20110221010001 is 10001012201102.

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 4924742118976 + 15185478891025 = 2219176^2 + 3896855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110221010001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110221010091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515600750 + ... + 515639751.

It is an arithmetic number, because the mean of its divisors is an integer number (5027813067501).

Almost surely, 2^{20110221010001} is an apocalyptic number.

It is an amenable number.

20110221010001 is a deficient number, since it is larger than the sum of its proper divisors (1031260003).

20110221010001 is a wasteful number, since it uses less digits than its factorization.

20110221010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031260002.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20110221010001 its reverse (10001012201102), we get a palindrome (30111233211103).

The spelling of 20110221010001 in words is "twenty trillion, one hundred ten billion, two hundred twenty-one million, ten thousand, one".