221211102001 has 16 divisors (see below), whose sum is σ = 233766178560. Its totient is φ = 208747808640.

The previous prime is 221211101989. The next prime is 221211102011. The reversal of 221211102001 is 100201112122.

It is a cyclic number.

It is not a de Polignac number, because 221211102001 - 2¹⁹ = 221210577713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211102011) 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 15 ways as a sum of consecutive naturals, for example, 19892895 + ... + 19904011.

It is an arithmetic number, because the mean of its divisors is an integer number (14610386160).

Almost surely, 2^221211102001 is an apocalyptic number.

It is an amenable number.

221211102001 is a deficient number, since it is larger than the sum of its proper divisors (12555076559).

221211102001 is a wasteful number, since it uses less digits than its factorization.

221211102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15144.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221211102001 its reverse (100201112122), we get a palindrome (321412214123).

The spelling of 221211102001 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred two thousand, one".