2021205343221 has 6 divisors (see below), whose sum is σ = 2919518829110. Its totient is φ = 1347470228808.

The previous prime is 2021205343207. The next prime is 2021205343231. The reversal of 2021205343221 is 1223435021202.

2021205343221 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 205 + 3 + 432 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1313522288100 + 707683055121 = 1146090^2 + 841239^2 .

It is not a de Polignac number, because 2021205343221 - 2⁷ = 2021205343093 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 (2021205343231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112289185726 + ... + 112289185743.

Almost surely, 2^{2021205343221} is an apocalyptic number.

It is an amenable number.

2021205343221 is a deficient number, since it is larger than the sum of its proper divisors (898313485889).

2021205343221 is a wasteful number, since it uses less digits than its factorization.

2021205343221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224578371475 (or 224578371472 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 2021205343221 in words is "two trillion, twenty-one billion, two hundred five million, three hundred forty-three thousand, two hundred twenty-one".