243351001021 has 16 divisors (see below), whose sum is σ = 252913881600. Its totient is φ = 233898408000.

The previous prime is 243351001007. The next prime is 243351001043. The reversal of 243351001021 is 120100153342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243351001021 - 2¹¹ = 243350998973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243351000983 and 243351001001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243351001081) 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, 4573671 + ... + 4626571.

It is an arithmetic number, because the mean of its divisors is an integer number (15807117600).

Almost surely, 2^243351001021 is an apocalyptic number.

It is an amenable number.

243351001021 is a deficient number, since it is larger than the sum of its proper divisors (9562880579).

243351001021 is a wasteful number, since it uses less digits than its factorization.

243351001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53940.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 243351001021 its reverse (120100153342), we get a palindrome (363451154363).

The spelling of 243351001021 in words is "two hundred forty-three billion, three hundred fifty-one million, one thousand, twenty-one".