121216258378 has 16 divisors (see below), whose sum is σ = 183278555136. Its totient is φ = 60124503600.

The previous prime is 121216258357. The next prime is 121216258381. The reversal of 121216258378 is 873852612121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52426 + ... + 495157.

It is an arithmetic number, because the mean of its divisors is an integer number (11454909696).

Almost surely, 2^121216258378 is an apocalyptic number.

121216258378 is a deficient number, since it is larger than the sum of its proper divisors (62062296758).

121216258378 is a wasteful number, since it uses less digits than its factorization.

121216258378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548469.

The product of its digits is 322560, while the sum is 46.

The spelling of 121216258378 in words is "one hundred twenty-one billion, two hundred sixteen million, two hundred fifty-eight thousand, three hundred seventy-eight".