243021321421 has 8 divisors (see below), whose sum is σ = 247165025184. Its totient is φ = 238912293360.

The previous prime is 243021321401. The next prime is 243021321427. The reversal of 243021321421 is 124123120342.

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 243021321421 - 2⁹ = 243021320909 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 (243021321427) 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, 8654790 + ... + 8682823.

It is an arithmetic number, because the mean of its divisors is an integer number (30895628148).

Almost surely, 2^243021321421 is an apocalyptic number.

It is an amenable number.

243021321421 is a deficient number, since it is larger than the sum of its proper divisors (4143703763).

243021321421 is a wasteful number, since it uses less digits than its factorization.

243021321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17337851.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 243021321421 its reverse (124123120342), we get a palindrome (367144441763).

The spelling of 243021321421 in words is "two hundred forty-three billion, twenty-one million, three hundred twenty-one thousand, four hundred twenty-one".