2021340906 has 40 divisors (see below), whose sum is σ = 4877713764. Its totient is φ = 621950400.

The previous prime is 2021340887. The next prime is 2021340913. The reversal of 2021340906 is 6090431202.

It can be written as a sum of positive squares in 2 ways, for example, as 1996749225 + 24591681 = 44685^2 + 4959^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2021340906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 477795 + ... + 482006.

Almost surely, 2^2021340906 is an apocalyptic number.

2021340906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2021340906 is an abundant number, since it is smaller than the sum of its proper divisors (2856372858).

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

2021340906 is a wasteful number, since it uses less digits than its factorization.

2021340906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959828 (or 959819 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 2021340906 is about 44959.3250171752. The cubic root of 2021340906 is about 1264.3865139642.

The spelling of 2021340906 in words is "two billion, twenty-one million, three hundred forty thousand, nine hundred six".