221000203001 has 4 divisors (see below), whose sum is σ = 221015692404. Its totient is φ = 220984713600.

The previous prime is 221000202949. The next prime is 221000203007. The reversal of 221000203001 is 100302000122.

It is a happy number.

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 4497043600 + 216503159401 = 67060^2 + 465299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000203001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000203007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7723280 + ... + 7751841.

It is an arithmetic number, because the mean of its divisors is an integer number (55253923101).

Almost surely, 2^221000203001 is an apocalyptic number.

It is an amenable number.

221000203001 is a deficient number, since it is larger than the sum of its proper divisors (15489403).

221000203001 is a wasteful number, since it uses less digits than its factorization.

221000203001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489402.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 221000203001 its reverse (100302000122), we get a palindrome (321302203123).

The spelling of 221000203001 in words is "two hundred twenty-one billion, two hundred three thousand, one".