2021343281 has 4 divisors (see below), whose sum is σ = 2024303472. Its totient is φ = 2018383092.

The previous prime is 2021343271. The next prime is 2021343287. The reversal of 2021343281 is 1823431202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021343281 - 2¹⁴ = 2021326897 is a prime.

It is a super-2 number, since 2×2021343281² = 8171657319287689922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021343281.

It is not an unprimeable number, because it can be changed into a prime (2021343287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1479071 + ... + 1480436.

It is an arithmetic number, because the mean of its divisors is an integer number (506075868).

Almost surely, 2^2021343281 is an apocalyptic number.

It is an amenable number.

2021343281 is a deficient number, since it is larger than the sum of its proper divisors (2960191).

2021343281 is an equidigital number, since it uses as much as digits as its factorization.

2021343281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960190.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 2021343281 is about 44959.3514299306. The cubic root of 2021343281 is about 1264.3870091663.

Adding to 2021343281 its reverse (1823431202), we get a palindrome (3844774483).

The spelling of 2021343281 in words is "two billion, twenty-one million, three hundred forty-three thousand, two hundred eighty-one".