2021221213 has 8 divisors (see below), whose sum is σ = 2205431136. Its totient is φ = 1837088400.

The previous prime is 2021221199. The next prime is 2021221231. The reversal of 2021221213 is 3121221202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021221213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021221243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44818 + ... + 77788.

It is an arithmetic number, because the mean of its divisors is an integer number (275678892).

Almost surely, 2^2021221213 is an apocalyptic number.

It is an amenable number.

2021221213 is a deficient number, since it is larger than the sum of its proper divisors (184209923).

2021221213 is a wasteful number, since it uses less digits than its factorization.

2021221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38555.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2021221213 is about 44957.9938720579. The cubic root of 2021221213 is about 1264.3615567355.

Adding to 2021221213 its reverse (3121221202), we get a palindrome (5142442415).

The spelling of 2021221213 in words is "two billion, twenty-one million, two hundred twenty-one thousand, two hundred thirteen".