243253031321421 has 32 divisors (see below), whose sum is σ = 394126479964800. Its totient is φ = 147054729191040.

The previous prime is 243253031321359. The next prime is 243253031321431. The reversal of 243253031321421 is 124123130352342.

243253031321421 is a `hidden beast` number, since 2 + 4 + 3 + 2 + 5 + 303 + 1 + 321 + 4 + 21 = 666.

It is not a de Polignac number, because 243253031321421 - 2⁴¹ = 241054008065869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243253031321431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1031410776 + ... + 1031646593.

It is an arithmetic number, because the mean of its divisors is an integer number (12316452498900).

Almost surely, 2^{243253031321421} is an apocalyptic number.

It is an amenable number.

243253031321421 is a deficient number, since it is larger than the sum of its proper divisors (150873448643379).

243253031321421 is a wasteful number, since it uses less digits than its factorization.

243253031321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063057786 (or 2063057780 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 243253031321421 its reverse (124123130352342), we get a palindrome (367376161673763).

The spelling of 243253031321421 in words is "two hundred forty-three trillion, two hundred fifty-three billion, thirty-one million, three hundred twenty-one thousand, four hundred twenty-one".