245343431243221 has 16 divisors (see below), whose sum is σ = 258583336197120. Its totient is φ = 232321660876800.

The previous prime is 245343431243213. The next prime is 245343431243233. The reversal of 245343431243221 is 122342134343542.

It is a cyclic number.

It is not a de Polignac number, because 245343431243221 - 2³ = 245343431243213 is a prime.

It is a super-3 number, since 3×245343431243221³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245343531243221) 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, 39548005 + ... + 45329146.

It is an arithmetic number, because the mean of its divisors is an integer number (16161458512320).

Almost surely, 2^{245343431243221} is an apocalyptic number.

It is an amenable number.

245343431243221 is a deficient number, since it is larger than the sum of its proper divisors (13239904953899).

245343431243221 is a wasteful number, since it uses less digits than its factorization.

245343431243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84878436.

The product of its digits is 1658880, while the sum is 43.

Adding to 245343431243221 its reverse (122342134343542), we get a palindrome (367685565586763).

The spelling of 245343431243221 in words is "two hundred forty-five trillion, three hundred forty-three billion, four hundred thirty-one million, two hundred forty-three thousand, two hundred twenty-one".