2101220001 has 16 divisors (see below), whose sum is σ = 3114496320. Its totient is φ = 1400103360.

The previous prime is 2101219997. The next prime is 2101220003. The reversal of 2101220001 is 1000221012.

2101220001 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2101220001 - 2² = 2101219997 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2101220003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37561 + ... + 74921.

It is an arithmetic number, because the mean of its divisors is an integer number (194656020).

Almost surely, 2^2101220001 is an apocalyptic number.

It is an amenable number.

2101220001 is a deficient number, since it is larger than the sum of its proper divisors (1013276319).

2101220001 is a wasteful number, since it uses less digits than its factorization.

2101220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39453 (or 39447 counting only the distinct ones).

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

The square root of 2101220001 is about 45839.0663190253. The cubic root of 2101220001 is about 1280.8271023553.

Adding to 2101220001 its reverse (1000221012), we get a palindrome (3101441013).

The spelling of 2101220001 in words is "two billion, one hundred one million, two hundred twenty thousand, one".