121342425555 has 128 divisors (see below), whose sum is σ = 221527353600. Its totient is φ = 56304599040.

The previous prime is 121342425541. The next prime is 121342425557. The reversal of 121342425555 is 555524243121.

It is not a de Polignac number, because 121342425555 - 2¹¹ = 121342423507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (121342425557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 44075059 + ... + 44077811.

It is an arithmetic number, because the mean of its divisors is an integer number (1730682450).

Almost surely, 2^121342425555 is an apocalyptic number.

121342425555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121342425555 is a deficient number, since it is larger than the sum of its proper divisors (100184928045).

121342425555 is a wasteful number, since it uses less digits than its factorization.

121342425555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001.

The product of its digits is 240000, while the sum is 39.

Adding to 121342425555 its reverse (555524243121), we get a palindrome (676866668676).

The spelling of 121342425555 in words is "one hundred twenty-one billion, three hundred forty-two million, four hundred twenty-five thousand, five hundred fifty-five".