121880020 has 24 divisors (see below), whose sum is σ = 259555968. Its totient is φ = 48064800.

The previous prime is 121879999. The next prime is 121880023. The reversal of 121880020 is 20088121.

It is a junction number, because it is equal to n+sod(n) for n = 121879973 and 121880000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121880023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41496 + ... + 44335.

It is an arithmetic number, because the mean of its divisors is an integer number (10814832).

Almost surely, 2^121880020 is an apocalyptic number.

121880020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121880020 is an abundant number, since it is smaller than the sum of its proper divisors (137675948).

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

121880020 is a wasteful number, since it uses less digits than its factorization.

121880020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85911 (or 85909 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 121880020 is about 11039.9284417971. The cubic root of 121880020 is about 495.8049278426.

The spelling of 121880020 in words is "one hundred twenty-one million, eight hundred eighty thousand, twenty".