240543534175421 has 2 divisors, whose sum is σ = 240543534175422. Its totient is φ = 240543534175420.

The previous prime is 240543534175397. The next prime is 240543534175453. The reversal of 240543534175421 is 124571435345042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239236595925625 + 1306938249796 = 15467275^2 + 1143214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240543534175421 is a prime.

It is a super-2 number, since 2×240543534175421² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 240543534175421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240543534175471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120271767087710 + 120271767087711.

It is an arithmetic number, because the mean of its divisors is an integer number (120271767087711).

Almost surely, 2^{240543534175421} is an apocalyptic number.

It is an amenable number.

240543534175421 is a deficient number, since it is larger than the sum of its proper divisors (1).

240543534175421 is an equidigital number, since it uses as much as digits as its factorization.

240543534175421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064000, while the sum is 50.

The spelling of 240543534175421 in words is "two hundred forty trillion, five hundred forty-three billion, five hundred thirty-four million, one hundred seventy-five thousand, four hundred twenty-one".