2221002001 has 4 divisors (see below), whose sum is σ = 2221253604. Its totient is φ = 2220750400.

The previous prime is 2221001983. The next prime is 2221002011. The reversal of 2221002001 is 1002001222.

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 765960976 + 1455041025 = 27676^2 + 38145^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221002001 - 2²⁵ = 2187447569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221002011) 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, 112060 + ... + 130381.

It is an arithmetic number, because the mean of its divisors is an integer number (555313401).

Almost surely, 2^2221002001 is an apocalyptic number.

It is an amenable number.

2221002001 is a deficient number, since it is larger than the sum of its proper divisors (251603).

2221002001 is an equidigital number, since it uses as much as digits as its factorization.

2221002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251602.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2221002001 is about 47127.5079014369. The cubic root of 2221002001 is about 1304.7169864299.

Adding to 2221002001 its reverse (1002001222), we get a palindrome (3223003223).

It can be divided in two parts, 222 and 1002001, that multiplied together give a palindrome (222444222).

The spelling of 2221002001 in words is "two billion, two hundred twenty-one million, two thousand, one".