243400120221 has 8 divisors (see below), whose sum is σ = 324539077824. Its totient is φ = 162263954720.

The previous prime is 243400120207. The next prime is 243400120231. The reversal of 243400120221 is 122021004342.

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 243400120221 - 2⁶ = 243400120157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243400120231) 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, 485361 + ... + 849926.

It is an arithmetic number, because the mean of its divisors is an integer number (40567384728).

Almost surely, 2^243400120221 is an apocalyptic number.

It is an amenable number.

243400120221 is a deficient number, since it is larger than the sum of its proper divisors (81138957603).

243400120221 is a wasteful number, since it uses less digits than its factorization.

243400120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396051.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 243400120221 its reverse (122021004342), we get a palindrome (365421124563).

The spelling of 243400120221 in words is "two hundred forty-three billion, four hundred million, one hundred twenty thousand, two hundred twenty-one".