2148921 has 12 divisors (see below), whose sum is σ = 3132948. Its totient is φ = 1419264.

The previous prime is 2148907. The next prime is 2148947. The reversal of 2148921 is 1298412.

It can be written as a sum of positive squares in 2 ways, for example, as 14400 + 2134521 = 120^2 + 1461^2 .

It is not a de Polignac number, because 2148921 - 2⁶ = 2148857 is a prime.

It is a super-2 number, since 2×2148921² = 9235722928482, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (261079).

2^2148921 is an apocalyptic number.

It is an amenable number.

2148921 is a deficient number, since it is larger than the sum of its proper divisors (984027).

2148921 is a wasteful number, since it uses less digits than its factorization.

2148921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232 (or 2229 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 2148921 is about 1465.9198477407. The cubic root of 2148921 is about 129.0446933654.

The spelling of 2148921 in words is "two million, one hundred forty-eight thousand, nine hundred twenty-one".