2121541 has 4 divisors (see below), whose sum is σ = 2135212. Its totient is φ = 2107872.

The previous prime is 2121529. The next prime is 2121569. The reversal of 2121541 is 1451212.

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 864900 + 1256641 = 930^2 + 1121^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121541 - 2⁹ = 2121029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121241) 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, 6600 + ... + 6913.

It is an arithmetic number, because the mean of its divisors is an integer number (533803).

2^2121541 is an apocalyptic number.

It is an amenable number.

2121541 is a deficient number, since it is larger than the sum of its proper divisors (13671).

2121541 is a wasteful number, since it uses less digits than its factorization.

2121541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13670.

The product of its digits is 80, while the sum is 16.

The square root of 2121541 is about 1456.5510632999. The cubic root of 2121541 is about 128.4942842921.

Adding to 2121541 its reverse (1451212), we get a palindrome (3572753).

It can be divided in two parts, 2121 and 541, that added together give a palindrome (2662).

The spelling of 2121541 in words is "two million, one hundred twenty-one thousand, five hundred forty-one".