243101421 has 18 divisors (see below), whose sum is σ = 367084718. Its totient is φ = 155018160.

The previous prime is 243101389. The next prime is 243101429. The reversal of 243101421 is 124101342.

243101421 is a `hidden beast` number, since 243 + 1 + 0 + 1 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135978921 + 107122500 = 11661^2 + 10350^2 .

It is not a de Polignac number, because 243101421 - 2⁵ = 243101389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243101394 and 243101403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243101429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20770 + ... + 30291.

Almost surely, 2^243101421 is an apocalyptic number.

It is an amenable number.

243101421 is a deficient number, since it is larger than the sum of its proper divisors (123983297).

243101421 is a wasteful number, since it uses less digits than its factorization.

243101421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51113 (or 51087 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 243101421 is about 15591.7100088477. The cubic root of 243101421 is about 624.1119513757. Note that the first 3 decimals are identical.

Adding to 243101421 its reverse (124101342), we get a palindrome (367202763).

The spelling of 243101421 in words is "two hundred forty-three million, one hundred one thousand, four hundred twenty-one".