2123541 has 24 divisors (see below), whose sum is σ = 3604224. Its totient is φ = 1179360.

The previous prime is 2123491. The next prime is 2123557. The reversal of 2123541 is 1453212.

2123541 is a `hidden beast` number, since 2 + 123 + 541 = 666.

It is not a de Polignac number, because 2123541 - 2¹⁷ = 1992469 is a prime.

It is an Ulam number.

2123541 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1876 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (150176).

2^2123541 is an apocalyptic number.

2123541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2123541 is a deficient number, since it is larger than the sum of its proper divisors (1480683).

2123541 is a wasteful number, since it uses less digits than its factorization.

2123541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 958 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2123541 is about 1457.2374549125. The cubic root of 2123541 is about 128.5346492682.

Adding to 2123541 its reverse (1453212), we get a palindrome (3576753).

The spelling of 2123541 in words is "two million, one hundred twenty-three thousand, five hundred forty-one".