121221425658 has 32 divisors (see below), whose sum is σ = 248388501312. Its totient is φ = 39416457600.

The previous prime is 121221425653. The next prime is 121221425659. The reversal of 121221425658 is 856524122121.

It is not an unprimeable number, because it can be changed into a prime (121221425653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2159973 + ... + 2215383.

It is an arithmetic number, because the mean of its divisors is an integer number (7762140666).

Almost surely, 2^121221425658 is an apocalyptic number.

121221425658 is an abundant number, since it is smaller than the sum of its proper divisors (127167075654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221425658 is a wasteful number, since it uses less digits than its factorization.

121221425658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64350.

The product of its digits is 76800, while the sum is 39.

Adding to 121221425658 its reverse (856524122121), we get a palindrome (977745547779).

The spelling of 121221425658 in words is "one hundred twenty-one billion, two hundred twenty-one million, four hundred twenty-five thousand, six hundred fifty-eight".