2121243541 has 8 divisors (see below), whose sum is σ = 2265177600. Its totient is φ = 1982028720.

The previous prime is 2121243521. The next prime is 2121243577. The reversal of 2121243541 is 1453421212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121243541 - 2⁷ = 2121243413 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 (2121243521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1178881 + ... + 1180678.

It is an arithmetic number, because the mean of its divisors is an integer number (283147200).

Almost surely, 2^2121243541 is an apocalyptic number.

It is an amenable number.

2121243541 is a deficient number, since it is larger than the sum of its proper divisors (143934059).

2121243541 is a wasteful number, since it uses less digits than its factorization.

2121243541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359619.

The product of its digits is 1920, while the sum is 25.

The square root of 2121243541 is about 46056.9597455151. The cubic root of 2121243541 is about 1284.8827866257.

Adding to 2121243541 its reverse (1453421212), we get a palindrome (3574664753).

The spelling of 2121243541 in words is "two billion, one hundred twenty-one million, two hundred forty-three thousand, five hundred forty-one".