243223622035621 has 4 divisors (see below), whose sum is σ = 243332349629292. Its totient is φ = 243114894441952.

The previous prime is 243223622035591. The next prime is 243223622035637. The reversal of 243223622035621 is 126530226322342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 188941134483396 + 54282487552225 = 13745586^2 + 7367665^2 .

It is a cyclic number.

It is not a de Polignac number, because 243223622035621 - 2¹³ = 243223622027429 is a prime.

It is a super-2 number, since 2×243223622035621² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243223622035651) 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, 54363793480 + ... + 54363797953.

It is an arithmetic number, because the mean of its divisors is an integer number (60833087407323).

Almost surely, 2^{243223622035621} is an apocalyptic number.

It is an amenable number.

243223622035621 is a deficient number, since it is larger than the sum of its proper divisors (108727593671).

243223622035621 is a wasteful number, since it uses less digits than its factorization.

243223622035621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108727593670.

The product of its (nonzero) digits is 1244160, while the sum is 43.

Adding to 243223622035621 its reverse (126530226322342), we get a palindrome (369753848357963).

The spelling of 243223622035621 in words is "two hundred forty-three trillion, two hundred twenty-three billion, six hundred twenty-two million, thirty-five thousand, six hundred twenty-one".