2111002021 has 4 divisors (see below), whose sum is σ = 2111552352. Its totient is φ = 2110451692.

The previous prime is 2111002007. The next prime is 2111002073. The reversal of 2111002021 is 1202001112.

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 2111002021 - 2⁹ = 2111001509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111001989 and 2111002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111008021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269371 + ... + 277096.

It is an arithmetic number, because the mean of its divisors is an integer number (527888088).

Almost surely, 2^2111002021 is an apocalyptic number.

It is an amenable number.

2111002021 is a deficient number, since it is larger than the sum of its proper divisors (550331).

2111002021 is an equidigital number, since it uses as much as digits as its factorization.

2111002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550330.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2111002021 is about 45945.6420240266. The cubic root of 2111002021 is about 1282.8116135494.

Adding to 2111002021 its reverse (1202001112), we get a palindrome (3313003133).

Subtracting from 2111002021 its reverse (1202001112), we obtain a palindrome (909000909).

The spelling of 2111002021 in words is "two billion, one hundred eleven million, two thousand, twenty-one".