2921121 has 24 divisors (see below), whose sum is σ = 4867200. Its totient is φ = 1653696.

The previous prime is 2921111. The next prime is 2921129. The reversal of 2921121 is 1211292.

It is not a de Polignac number, because 2921121 - 2⁵ = 2921089 is a prime.

2921121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2921094 and 2921103.

It is not an unprimeable number, because it can be changed into a prime (2921129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12421 + ... + 12653.

It is an arithmetic number, because the mean of its divisors is an integer number (202800).

2^2921121 is an apocalyptic number.

2921121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2921121 is a deficient number, since it is larger than the sum of its proper divisors (1946079).

2921121 is a wasteful number, since it uses less digits than its factorization.

2921121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 442 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 2921121 is about 1709.1287254037. The cubic root of 2921121 is about 142.9496782855.

The spelling of 2921121 in words is "two million, nine hundred twenty-one thousand, one hundred twenty-one".