221012010001 has 4 divisors (see below), whose sum is σ = 221030910004. Its totient is φ = 220993110000.

The previous prime is 221012009917. The next prime is 221012010059. The reversal of 221012010001 is 100010210122.

221012010001 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 an emirpimes, since its reverse is a distinct semiprime: 100010210122 = 2 ⋅50005105061.

It can be written as a sum of positive squares in 2 ways, for example, as 185803240401 + 35208769600 = 431049^2 + 187640^2 .

It is a cyclic number.

It is not a de Polignac number, because 221012010001 - 2⁹ = 221012009489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221012010001.

It is not an unprimeable number, because it can be changed into a prime (221012010061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9432450 + ... + 9455851.

It is an arithmetic number, because the mean of its divisors is an integer number (55257727501).

Almost surely, 2^221012010001 is an apocalyptic number.

It is an amenable number.

221012010001 is a deficient number, since it is larger than the sum of its proper divisors (18900003).

221012010001 is a wasteful number, since it uses less digits than its factorization.

221012010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18900002.

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

Adding to 221012010001 its reverse (100010210122), we get a palindrome (321022220123).

The spelling of 221012010001 in words is "two hundred twenty-one billion, twelve million, ten thousand, one".