2021121340221 has 16 divisors (see below), whose sum is σ = 2701948599936. Its totient is φ = 1343858851776.

The previous prime is 2021121340157. The next prime is 2021121340241. The reversal of 2021121340221 is 1220431211202.

It is a happy number.

It is not a de Polignac number, because 2021121340221 - 2⁶ = 2021121340157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121340241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1136511 + ... + 2309523.

It is an arithmetic number, because the mean of its divisors is an integer number (168871787496).

Almost surely, 2^{2021121340221} is an apocalyptic number.

It is an amenable number.

2021121340221 is a deficient number, since it is larger than the sum of its proper divisors (680827259715).

2021121340221 is a wasteful number, since it uses less digits than its factorization.

2021121340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174532.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2021121340221 its reverse (1220431211202), we get a palindrome (3241552551423).

The spelling of 2021121340221 in words is "two trillion, twenty-one billion, one hundred twenty-one million, three hundred forty thousand, two hundred twenty-one".