121978022220 has 36 divisors (see below), whose sum is σ = 370000001280. Its totient is φ = 32527472544.

The previous prime is 121978022219. The next prime is 121978022261. The reversal of 121978022220 is 22220879121.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338827660 + ... + 338828019.

Almost surely, 2^121978022220 is an apocalyptic number.

121978022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121978022220 is an abundant number, since it is smaller than the sum of its proper divisors (248021979060).

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

121978022220 is a wasteful number, since it uses less digits than its factorization.

121978022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677655694 (or 677655689 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 121978022220 in words is "one hundred twenty-one billion, nine hundred seventy-eight million, twenty-two thousand, two hundred twenty".