2021121221221 has 8 divisors (see below), whose sum is σ = 2045543149440. Its totient is φ = 1996700985312.

The previous prime is 2021121221201. The next prime is 2021121221243. The reversal of 2021121221221 is 1221221211202.

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 2021121221221 - 2¹³ = 2021121213029 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 (2021121221201) 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, 2068020 + ... + 2884258.

It is an arithmetic number, because the mean of its divisors is an integer number (255692893680).

Almost surely, 2^{2021121221221} is an apocalyptic number.

It is an amenable number.

2021121221221 is a deficient number, since it is larger than the sum of its proper divisors (24421928219).

2021121221221 is an equidigital number, since it uses as much as digits as its factorization.

2021121221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846155.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2021121221221 its reverse (1221221211202), we get a palindrome (3242342432423).

The spelling of 2021121221221 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".