2119728121 has 16 divisors (see below), whose sum is σ = 2453140864. Its totient is φ = 1794109824.

The previous prime is 2119728109. The next prime is 2119728173. The reversal of 2119728121 is 1218279112.

It is a cyclic number.

It is not a de Polignac number, because 2119728121 - 2⁵ = 2119728089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2119729121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173221 + ... + 185053.

It is an arithmetic number, because the mean of its divisors is an integer number (153321304).

Almost surely, 2^2119728121 is an apocalyptic number.

It is an amenable number.

2119728121 is a deficient number, since it is larger than the sum of its proper divisors (333412743).

2119728121 is a wasteful number, since it uses less digits than its factorization.

2119728121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12160.

The product of its digits is 4032, while the sum is 34.

The square root of 2119728121 is about 46040.5052209465. The cubic root of 2119728121 is about 1284.5767395832.

The spelling of 2119728121 in words is "two billion, one hundred nineteen million, seven hundred twenty-eight thousand, one hundred twenty-one".