2149121 has 4 divisors (see below), whose sum is σ = 2314452. Its totient is φ = 1983792.

The previous prime is 2149117. The next prime is 2149127. The reversal of 2149121 is 1219412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87025 + 2062096 = 295^2 + 1436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149121 - 2² = 2149117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2149093 and 2149102.

It is not an unprimeable number, because it can be changed into a prime (2149127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82646 + ... + 82671.

It is an arithmetic number, because the mean of its divisors is an integer number (578613).

2^2149121 is an apocalyptic number.

It is an amenable number.

2149121 is a deficient number, since it is larger than the sum of its proper divisors (165331).

2149121 is a wasteful number, since it uses less digits than its factorization.

2149121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165330.

The product of its digits is 144, while the sum is 20.

The square root of 2149121 is about 1465.9880627072. The cubic root of 2149121 is about 129.0486966362.

It can be divided in two parts, 21491 and 21, that added together give a palindrome (21512).

The spelling of 2149121 in words is "two million, one hundred forty-nine thousand, one hundred twenty-one".