221010211001 has 4 divisors (see below), whose sum is σ = 224037748212. Its totient is φ = 217982673792.

The previous prime is 221010210959. The next prime is 221010211013. The reversal of 221010211001 is 100112010122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100112010122 = 2 ⋅50056005061.

It can be written as a sum of positive squares in 2 ways, for example, as 160272115600 + 60738095401 = 400340^2 + 246451^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010211001 - 2⁶ = 221010210937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221010211021) 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, 1513768496 + ... + 1513768641.

It is an arithmetic number, because the mean of its divisors is an integer number (56009437053).

Almost surely, 2^221010211001 is an apocalyptic number.

It is an amenable number.

221010211001 is a deficient number, since it is larger than the sum of its proper divisors (3027537211).

221010211001 is an equidigital number, since it uses as much as digits as its factorization.

221010211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027537210.

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

Adding to 221010211001 its reverse (100112010122), we get a palindrome (321122221123).

The spelling of 221010211001 in words is "two hundred twenty-one billion, ten million, two hundred eleven thousand, one".