2928981921 has 16 divisors (see below), whose sum is σ = 3946518720. Its totient is φ = 1932075200.

The previous prime is 2928981911. The next prime is 2928981929. The reversal of 2928981921 is 1291898292.

It is a cyclic number.

It is not a de Polignac number, because 2928981921 - 2⁵ = 2928981889 is a prime.

It is a super-4 number, since 4×2928981921⁴ (a number of 39 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2928981929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879766 + ... + 883088.

It is an arithmetic number, because the mean of its divisors is an integer number (246657420).

Almost surely, 2^2928981921 is an apocalyptic number.

It is an amenable number.

2928981921 is a deficient number, since it is larger than the sum of its proper divisors (1017536799).

2928981921 is a wasteful number, since it uses less digits than its factorization.

2928981921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336.

The product of its digits is 373248, while the sum is 51.

The square root of 2928981921 is about 54120.0694844343. The cubic root of 2928981921 is about 1430.7779230239. Note that the first 3 decimals are identical.

The spelling of 2928981921 in words is "two billion, nine hundred twenty-eight million, nine hundred eighty-one thousand, nine hundred twenty-one".