2021022221 has 8 divisors (see below), whose sum is σ = 2054048664. Its totient is φ = 1988251200.

The previous prime is 2021022217. The next prime is 2021022287. The reversal of 2021022221 is 1222201202.

It can be written as a sum of positive squares in 4 ways, for example, as 1367964196 + 653058025 = 36986^2 + 25555^2 .

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 2021022221 - 2² = 2021022217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021022196 and 2021022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021027221) 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, 47870 + ... + 79583.

It is an arithmetic number, because the mean of its divisors is an integer number (256756083).

Almost surely, 2^2021022221 is an apocalyptic number.

It is an amenable number.

2021022221 is a deficient number, since it is larger than the sum of its proper divisors (33026443).

2021022221 is a wasteful number, since it uses less digits than its factorization.

2021022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127711.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2021022221 is about 44955.7807295124. The cubic root of 2021022221 is about 1264.3200626641.

Adding to 2021022221 its reverse (1222201202), we get a palindrome (3243223423).

The spelling of 2021022221 in words is "two billion, twenty-one million, twenty-two thousand, two hundred twenty-one".