2021666667 has 16 divisors (see below), whose sum is σ = 2740666752. Its totient is φ = 1325407040.

The previous prime is 2021666657. The next prime is 2021666693. The reversal of 2021666667 is 7666661202.

It is a cyclic number.

It is not a de Polignac number, because 2021666667 - 2⁴ = 2021666651 is a prime.

It is a super-2 number, since 2×2021666667² = 8174272224917777778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2021666657) 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, 20992 + ... + 66962.

It is an arithmetic number, because the mean of its divisors is an integer number (171291672).

Almost surely, 2^2021666667 is an apocalyptic number.

2021666667 is a deficient number, since it is larger than the sum of its proper divisors (719000085).

2021666667 is a wasteful number, since it uses less digits than its factorization.

2021666667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46218.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 2021666667 is about 44962.9477125333. The cubic root of 2021666667 is about 1264.4544335136.

The spelling of 2021666667 in words is "two billion, twenty-one million, six hundred sixty-six thousand, six hundred sixty-seven".