2086440921 has 6 divisors (see below), whose sum is σ = 3013748010. Its totient is φ = 1390960608.

The previous prime is 2086440919. The next prime is 2086441001. The reversal of 2086440921 is 1290446802.

2086440921 is a `hidden beast` number, since 2 + 0 + 8 + 644 + 0 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2079360000 + 7080921 = 45600^2 + 2661^2 .

It is not a de Polignac number, because 2086440921 - 2¹ = 2086440919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2086440721) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 115913376 + ... + 115913393.

It is an arithmetic number, because the mean of its divisors is an integer number (502291335).

Almost surely, 2^2086440921 is an apocalyptic number.

It is an amenable number.

2086440921 is a deficient number, since it is larger than the sum of its proper divisors (927307089).

2086440921 is a wasteful number, since it uses less digits than its factorization.

2086440921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231826775 (or 231826772 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 2086440921 is about 45677.5756909230. The cubic root of 2086440921 is about 1277.8171048343.

The spelling of 2086440921 in words is "two billion, eighty-six million, four hundred forty thousand, nine hundred twenty-one".