2121111001 has 4 divisors (see below), whose sum is σ = 2121611904. Its totient is φ = 2120610100.

The previous prime is 2121110983. The next prime is 2121111007. The reversal of 2121111001 is 1001111212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121111001 - 2¹⁵ = 2121078233 is a prime.

It is a super-2 number, since 2×2121111001² = 8998223757126444002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121111007) 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, 244045 + ... + 252586.

It is an arithmetic number, because the mean of its divisors is an integer number (530402976).

Almost surely, 2^2121111001 is an apocalyptic number.

It is an amenable number.

2121111001 is a deficient number, since it is larger than the sum of its proper divisors (500903).

2121111001 is an equidigital number, since it uses as much as digits as its factorization.

2121111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500902.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 2121111001 is about 46055.5208525536. The cubic root of 2121111001 is about 1284.8560252931.

Adding to 2121111001 its reverse (1001111212), we get a palindrome (3122222213).

The spelling of 2121111001 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, one".