221110101001 has 4 divisors (see below), whose sum is σ = 221291786772. Its totient is φ = 220928415232.

The previous prime is 221110100983. The next prime is 221110101007. The reversal of 221110101001 is 100101011122.

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 29130296976 + 191979804025 = 170676^2 + 438155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221110101001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221110101007) 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, 90841060 + ... + 90843493.

It is an arithmetic number, because the mean of its divisors is an integer number (55322946693).

Almost surely, 2^221110101001 is an apocalyptic number.

It is an amenable number.

221110101001 is a deficient number, since it is larger than the sum of its proper divisors (181685771).

221110101001 is a wasteful number, since it uses less digits than its factorization.

221110101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181685770.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 221110101001 its reverse (100101011122), we get a palindrome (321211112123).

The spelling of 221110101001 in words is "two hundred twenty-one billion, one hundred ten million, one hundred one thousand, one".