2120881 has 4 divisors (see below), whose sum is σ = 2423872. Its totient is φ = 1817892.

The previous prime is 2120879. The next prime is 2120887. The reversal of 2120881 is 1880212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2120881 - 2¹ = 2120879 is a prime.

It is a super-2 number, since 2×2120881² = 8996272432322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151485 + ... + 151498.

It is an arithmetic number, because the mean of its divisors is an integer number (605968).

2^2120881 is an apocalyptic number.

It is an amenable number.

2120881 is a deficient number, since it is larger than the sum of its proper divisors (302991).

2120881 is an equidigital number, since it uses as much as digits as its factorization.

2120881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302990.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 2120881 is about 1456.3244830737. The cubic root of 2120881 is about 128.4809582831.

It can be divided in two parts, 21 and 20881, that added together give a palindrome (20902).

The spelling of 2120881 in words is "two million, one hundred twenty thousand, eight hundred eighty-one".