221000020101001 has 4 divisors (see below), whose sum is σ = 223188139112004. Its totient is φ = 218811901090000.

The previous prime is 221000020100969. The next prime is 221000020101011. The reversal of 221000020101001 is 100101020000122.

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 215578037995776 + 5421982105225 = 14682576^2 + 2328515^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000020101001 - 2⁵ = 221000020100969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000020101011) 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, 1094059505350 + ... + 1094059505551.

It is an arithmetic number, because the mean of its divisors is an integer number (55797034778001).

Almost surely, 2^{221000020101001} is an apocalyptic number.

It is an amenable number.

221000020101001 is a deficient number, since it is larger than the sum of its proper divisors (2188119011003).

221000020101001 is a wasteful number, since it uses less digits than its factorization.

221000020101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188119011002.

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

Adding to 221000020101001 its reverse (100101020000122), we get a palindrome (321101040101123).

The spelling of 221000020101001 in words is "two hundred twenty-one trillion, twenty million, one hundred one thousand, one".