2021221000221 has 8 divisors (see below), whose sum is σ = 2696648854944. Its totient is φ = 1346636906160.

The previous prime is 2021221000151. The next prime is 2021221000223. The reversal of 2021221000221 is 1220001221202.

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

It is not a de Polignac number, because 2021221000221 - 2¹³ = 2021220992029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021221000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021221000223) 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, 210934575 + ... + 210944156.

It is an arithmetic number, because the mean of its divisors is an integer number (337081106868).

Almost surely, 2^{2021221000221} is an apocalyptic number.

It is an amenable number.

2021221000221 is a deficient number, since it is larger than the sum of its proper divisors (675427854723).

2021221000221 is a wasteful number, since it uses less digits than its factorization.

2021221000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421880331.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2021221000221 its reverse (1220001221202), we get a palindrome (3241222221423).

The spelling of 2021221000221 in words is "two trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.