2148521 has 4 divisors (see below), whose sum is σ = 2155344. Its totient is φ = 2141700.

The previous prime is 2148491. The next prime is 2148527. The reversal of 2148521 is 1258412.

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 2148521 - 2⁶ = 2148457 is a prime.

It is a super-2 number, since 2×2148521² = 9232284974882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2148527) 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, 2915 + ... + 3576.

It is an arithmetic number, because the mean of its divisors is an integer number (538836).

2^2148521 is an apocalyptic number.

It is an amenable number.

2148521 is a deficient number, since it is larger than the sum of its proper divisors (6823).

2148521 is an equidigital number, since it uses as much as digits as its factorization.

2148521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822.

The product of its digits is 640, while the sum is 23.

The square root of 2148521 is about 1465.7834082838. The cubic root of 2148521 is about 129.0366860786.

The spelling of 2148521 in words is "two million, one hundred forty-eight thousand, five hundred twenty-one".