2021868505 has 8 divisors (see below), whose sum is σ = 2426529672. Its totient is φ = 1617303168.

The previous prime is 2021868461. The next prime is 2021868523. The reversal of 2021868505 is 5058681202.

It can be written as a sum of positive squares in 4 ways, for example, as 370909081 + 1650959424 = 19259^2 + 40632^2 .

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 2021868505 - 2¹⁷ = 2021737433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36199 + ... + 73171.

It is an arithmetic number, because the mean of its divisors is an integer number (303316209).

Almost surely, 2^2021868505 is an apocalyptic number.

It is an amenable number.

2021868505 is a deficient number, since it is larger than the sum of its proper divisors (404661167).

2021868505 is a wasteful number, since it uses less digits than its factorization.

2021868505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47915.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 2021868505 is about 44965.1921490390. The cubic root of 2021868505 is about 1264.4965120727.

The spelling of 2021868505 in words is "two billion, twenty-one million, eight hundred sixty-eight thousand, five hundred five".