2152121 has 4 divisors (see below), whose sum is σ = 2156112. Its totient is φ = 2148132.

The previous prime is 2152103. The next prime is 2152123. The reversal of 2152121 is 1212512.

2152121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2152121 - 2¹⁴ = 2135737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2152096 and 2152105.

It is not an unprimeable number, because it can be changed into a prime (2152123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031 + ... + 2316.

It is an arithmetic number, because the mean of its divisors is an integer number (539028).

2^2152121 is an apocalyptic number.

It is an amenable number.

2152121 is a deficient number, since it is larger than the sum of its proper divisors (3991).

2152121 is an equidigital number, since it uses as much as digits as its factorization.

2152121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its digits is 40, while the sum is 14.

The square root of 2152121 is about 1467.0109065716. The cubic root of 2152121 is about 129.1087159166.

Adding to 2152121 its reverse (1212512), we get a palindrome (3364633).

The spelling of 2152121 in words is "two million, one hundred fifty-two thousand, one hundred twenty-one".