210001220001 has 8 divisors (see below), whose sum is σ = 311112918560. Its totient is φ = 140000813316.

The previous prime is 210001219937. The next prime is 210001220027. The reversal of 210001220001 is 100022100012.

It is not a de Polignac number, because 210001220001 - 2⁶ = 210001219937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210001220041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3888911455 + ... + 3888911508.

It is an arithmetic number, because the mean of its divisors is an integer number (38889114820).

Almost surely, 2^210001220001 is an apocalyptic number.

It is an amenable number.

210001220001 is a deficient number, since it is larger than the sum of its proper divisors (101111698559).

210001220001 is an equidigital number, since it uses as much as digits as its factorization.

210001220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777822972 (or 7777822966 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210001220001 its reverse (100022100012), we get a palindrome (310023320013).

The spelling of 210001220001 in words is "two hundred ten billion, one million, two hundred twenty thousand, one".