2121020111 has 8 divisors (see below), whose sum is σ = 2424514560. Its totient is φ = 1817648568.

The previous prime is 2121020071. The next prime is 2121020117. The reversal of 2121020111 is 1110201212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121020111 - 2²² = 2116825807 is a prime.

It is a super-2 number, since 2×2121020111² = 8997452622532904642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121020092 and 2121020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020117) 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 7 ways as a sum of consecutive naturals, for example, 9830 + ... + 65868.

It is an arithmetic number, because the mean of its divisors is an integer number (303064320).

Almost surely, 2^2121020111 is an apocalyptic number.

2121020111 is a deficient number, since it is larger than the sum of its proper divisors (303494449).

2121020111 is an equidigital number, since it uses as much as digits as its factorization.

2121020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61453.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2121020111 is about 46054.5340981754. The cubic root of 2121020111 is about 1284.8376729246.

Adding to 2121020111 its reverse (1110201212), we get a palindrome (3231221323).

The spelling of 2121020111 in words is "two billion, one hundred twenty-one million, twenty thousand, one hundred eleven".