2021809942 has 8 divisors (see below), whose sum is σ = 3032919000. Its totient is φ = 1010836944.

The previous prime is 2021809939. The next prime is 2021810033. The reversal of 2021809942 is 2499081202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20809 + ... + 66907.

It is an arithmetic number, because the mean of its divisors is an integer number (379114875).

Almost surely, 2^2021809942 is an apocalyptic number.

2021809942 is a deficient number, since it is larger than the sum of its proper divisors (1011109058).

2021809942 is a wasteful number, since it uses less digits than its factorization.

2021809942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68030.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 2021809942 is about 44964.5409406123. The cubic root of 2021809942 is about 1264.4843033289.

The spelling of 2021809942 in words is "two billion, twenty-one million, eight hundred nine thousand, nine hundred forty-two".