2021666154 has 16 divisors (see below), whose sum is σ = 4182757920. Its totient is φ = 650651120.

The previous prime is 2021666149. The next prime is 2021666189. The reversal of 2021666154 is 4516661202.

It is an unprimeable number.

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, 5809212 + ... + 5809559.

It is an arithmetic number, because the mean of its divisors is an integer number (261422370).

Almost surely, 2^2021666154 is an apocalyptic number.

2021666154 is an abundant number, since it is smaller than the sum of its proper divisors (2161091766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021666154 is a wasteful number, since it uses less digits than its factorization.

2021666154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11618805.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2021666154 is about 44962.9420078357. The cubic root of 2021666154 is about 1264.4543265614.

The spelling of 2021666154 in words is "two billion, twenty-one million, six hundred sixty-six thousand, one hundred fifty-four".