121505434543 has 2 divisors, whose sum is σ = 121505434544. Its totient is φ = 121505434542.

The previous prime is 121505434537. The next prime is 121505434553. The reversal of 121505434543 is 345434505121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121505434543 - 2²⁹ = 120968563631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121505434553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60752717271 + 60752717272.

It is an arithmetic number, because the mean of its divisors is an integer number (60752717272).

Almost surely, 2^121505434543 is an apocalyptic number.

121505434543 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505434543 is an equidigital number, since it uses as much as digits as its factorization.

121505434543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 121505434543 its reverse (345434505121), we get a palindrome (466939939664).

The spelling of 121505434543 in words is "one hundred twenty-one billion, five hundred five million, four hundred thirty-four thousand, five hundred forty-three".