2021211221 has 8 divisors (see below), whose sum is σ = 2036161920. Its totient is φ = 2006307072.

The previous prime is 2021211217. The next prime is 2021211229. The reversal of 2021211221 is 1221121202.

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 2021211221 - 2² = 2021211217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021211196 and 2021211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021211229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78050 + ... + 100668.

It is an arithmetic number, because the mean of its divisors is an integer number (254520240).

Almost surely, 2^2021211221 is an apocalyptic number.

It is an amenable number.

2021211221 is a deficient number, since it is larger than the sum of its proper divisors (14950699).

2021211221 is a wasteful number, since it uses less digits than its factorization.

2021211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23275.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2021211221 is about 44957.8827459657. The cubic root of 2021211221 is about 1264.3594732555.

Adding to 2021211221 its reverse (1221121202), we get a palindrome (3242332423).

The spelling of 2021211221 in words is "two billion, twenty-one million, two hundred eleven thousand, two hundred twenty-one".