2021131221 has 8 divisors (see below), whose sum is σ = 2718690240. Its totient is φ = 1335496512.

The previous prime is 2021131159. The next prime is 2021131247. The reversal of 2021131221 is 1221311202.

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

It is not a de Polignac number, because 2021131221 - 2⁶ = 2021131157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021131261) 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, 2980681 + ... + 2981358.

It is an arithmetic number, because the mean of its divisors is an integer number (339836280).

Almost surely, 2^2021131221 is an apocalyptic number.

It is an amenable number.

2021131221 is a deficient number, since it is larger than the sum of its proper divisors (697559019).

2021131221 is a wasteful number, since it uses less digits than its factorization.

2021131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962155.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2021131221 is about 44956.9930155476. The cubic root of 2021131221 is about 1264.3427918236.

Adding to 2021131221 its reverse (1221311202), we get a palindrome (3242442423).

The spelling of 2021131221 in words is "two billion, twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".