243120621 has 16 divisors (see below), whose sum is σ = 344784384. Its totient is φ = 151855104.

The previous prime is 243120589. The next prime is 243120629. The reversal of 243120621 is 126021342.

It is not a de Polignac number, because 243120621 - 2⁵ = 243120589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243120629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685 + ... + 22061.

It is an arithmetic number, because the mean of its divisors is an integer number (21549024).

Almost surely, 2^243120621 is an apocalyptic number.

It is an amenable number.

243120621 is a deficient number, since it is larger than the sum of its proper divisors (101663763).

243120621 is a wasteful number, since it uses less digits than its factorization.

243120621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21620.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 243120621 is about 15592.3257085016. The cubic root of 243120621 is about 624.1283816019.

Adding to 243120621 its reverse (126021342), we get a palindrome (369141963).

The spelling of 243120621 in words is "two hundred forty-three million, one hundred twenty thousand, six hundred twenty-one".