2920005921 has 16 divisors (see below), whose sum is σ = 4455626624. Its totient is φ = 1666289664.

The previous prime is 2920005919. The next prime is 2920005947. The reversal of 2920005921 is 1295000292.

It is not a de Polignac number, because 2920005921 - 2¹ = 2920005919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2920005721) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 79456 + ... + 110241.

It is an arithmetic number, because the mean of its divisors is an integer number (278476664).

Almost surely, 2^2920005921 is an apocalyptic number.

2920005921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2920005921 is a deficient number, since it is larger than the sum of its proper divisors (1535620703).

2920005921 is a wasteful number, since it uses less digits than its factorization.

2920005921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190440.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2920005921 is about 54037.0791309079. The cubic root of 2920005921 is about 1429.3148658545.

The spelling of 2920005921 in words is "two billion, nine hundred twenty million, five thousand, nine hundred twenty-one".