121423423545 has 32 divisors (see below), whose sum is σ = 223307452800. Its totient is φ = 62526082752.

The previous prime is 121423423489. The next prime is 121423423573. The reversal of 121423423545 is 545324324121.

It is a happy number.

121423423545 is a `hidden beast` number, since 1 + 21 + 42 + 34 + 23 + 545 = 666.

It is not a de Polignac number, because 121423423545 - 2¹⁰ = 121423422521 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 15503547 + ... + 15511376.

It is an arithmetic number, because the mean of its divisors is an integer number (6978357900).

Almost surely, 2^121423423545 is an apocalyptic number.

121423423545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121423423545 is a deficient number, since it is larger than the sum of its proper divisors (101884029255).

121423423545 is a wasteful number, since it uses less digits than its factorization.

121423423545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31014966 (or 31014960 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 121423423545 its reverse (545324324121), we get a palindrome (666747747666).

The spelling of 121423423545 in words is "one hundred twenty-one billion, four hundred twenty-three million, four hundred twenty-three thousand, five hundred forty-five".