121220976655578 has 64 divisors (see below), whose sum is σ = 244375554441600. Its totient is φ = 40085919498240.

The previous prime is 121220976655543. The next prime is 121220976655579. The reversal of 121220976655578 is 875556679022121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121220976655579) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4099581978 + ... + 4099611546.

It is an arithmetic number, because the mean of its divisors is an integer number (3818368038150).

Almost surely, 2^{121220976655578} is an apocalyptic number.

121220976655578 is an abundant number, since it is smaller than the sum of its proper divisors (123154577786022).

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

121220976655578 is a wasteful number, since it uses less digits than its factorization.

121220976655578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39487.

The product of its (nonzero) digits is 127008000, while the sum is 66.

The spelling of 121220976655578 in words is "one hundred twenty-one trillion, two hundred twenty billion, nine hundred seventy-six million, six hundred fifty-five thousand, five hundred seventy-eight".