243400102021 has 4 divisors (see below), whose sum is σ = 246828272544. Its totient is φ = 239971931500.

The previous prime is 243400102007. The next prime is 243400102073. The reversal of 243400102021 is 120201004342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243400102021 - 2¹¹ = 243400099973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243400102021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243400102721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1714085155 + ... + 1714085296.

It is an arithmetic number, because the mean of its divisors is an integer number (61707068136).

Almost surely, 2^243400102021 is an apocalyptic number.

It is an amenable number.

243400102021 is a deficient number, since it is larger than the sum of its proper divisors (3428170523).

243400102021 is an equidigital number, since it uses as much as digits as its factorization.

243400102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428170522.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 243400102021 its reverse (120201004342), we get a palindrome (363601106363).

The spelling of 243400102021 in words is "two hundred forty-three billion, four hundred million, one hundred two thousand, twenty-one".