2921389985 has 4 divisors (see below), whose sum is σ = 3505667988. Its totient is φ = 2337111984.

The previous prime is 2921389967. The next prime is 2921390009. The reversal of 2921389985 is 5899831292.

2921389985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2087393344 + 833996641 = 45688^2 + 28879^2 .

It is a cyclic number.

It is not a de Polignac number, because 2921389985 - 2⁶ = 2921389921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2921389985.

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, 292138994 + ... + 292139003.

It is an arithmetic number, because the mean of its divisors is an integer number (876416997).

Almost surely, 2^2921389985 is an apocalyptic number.

It is an amenable number.

2921389985 is a deficient number, since it is larger than the sum of its proper divisors (584278003).

2921389985 is an equidigital number, since it uses as much as digits as its factorization.

2921389985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584278002.

The product of its digits is 2799360, while the sum is 56.

The square root of 2921389985 is about 54049.8842274431. The cubic root of 2921389985 is about 1429.5406588638.

The spelling of 2921389985 in words is "two billion, nine hundred twenty-one million, three hundred eighty-nine thousand, nine hundred eighty-five".