2021808281 has 8 divisors (see below), whose sum is σ = 2067657504. Its totient is φ = 1976420160.

The previous prime is 2021808233. The next prime is 2021808287. The reversal of 2021808281 is 1828081202.

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 2021808281 - 2¹⁴ = 2021791897 is a prime.

It is a super-2 number, since 2×2021808281² = 8175417450240349922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021808287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106400 + ... + 123953.

It is an arithmetic number, because the mean of its divisors is an integer number (258457188).

Almost surely, 2^2021808281 is an apocalyptic number.

It is an amenable number.

2021808281 is a deficient number, since it is larger than the sum of its proper divisors (45849223).

2021808281 is a wasteful number, since it uses less digits than its factorization.

2021808281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230551.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 2021808281 is about 44964.5224704989. The cubic root of 2021808281 is about 1264.4839570535.

Adding to 2021808281 its reverse (1828081202), we get a palindrome (3849889483).

The spelling of 2021808281 in words is "two billion, twenty-one million, eight hundred eight thousand, two hundred eighty-one".