2121021211 has 8 divisors (see below), whose sum is σ = 2176871760. Its totient is φ = 2065882368.

The previous prime is 2121021197. The next prime is 2121021223. The reversal of 2121021211 is 1121201212.

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 2121021211 - 2¹⁷ = 2120890139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121021191 and 2121021200.

It is not an unprimeable number, because it can be changed into a prime (2121021241) 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, 171886 + ... + 183811.

It is an arithmetic number, because the mean of its divisors is an integer number (272108970).

Almost surely, 2^2121021211 is an apocalyptic number.

2121021211 is a deficient number, since it is larger than the sum of its proper divisors (55850549).

2121021211 is an equidigital number, since it uses as much as digits as its factorization.

2121021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355853.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2121021211 is about 46054.5460405376. The cubic root of 2121021211 is about 1284.8378950380.

Adding to 2121021211 its reverse (1121201212), we get a palindrome (3242222423).

The spelling of 2121021211 in words is "two billion, one hundred twenty-one million, twenty-one thousand, two hundred eleven".