121445435421 has 12 divisors (see below), whose sum is σ = 181079932800. Its totient is φ = 78351893640.

The previous prime is 121445435407. The next prime is 121445435497. The reversal of 121445435421 is 124534544121.

121445435421 is a `hidden beast` number, since 1 + 2 + 1 + 44 + 543 + 54 + 21 = 666.

It is not a de Polignac number, because 121445435421 - 2⁵ = 121445435389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121445435621) 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 11 ways as a sum of consecutive naturals, for example, 217643871 + ... + 217644428.

It is an arithmetic number, because the mean of its divisors is an integer number (15089994400).

Almost surely, 2^121445435421 is an apocalyptic number.

It is an amenable number.

121445435421 is a deficient number, since it is larger than the sum of its proper divisors (59634497379).

121445435421 is a wasteful number, since it uses less digits than its factorization.

121445435421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435288336 (or 435288333 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

Adding to 121445435421 its reverse (124534544121), we get a palindrome (245979979542).

The spelling of 121445435421 in words is "one hundred twenty-one billion, four hundred forty-five million, four hundred thirty-five thousand, four hundred twenty-one".