121280420 has 24 divisors (see below), whose sum is σ = 268094400. Its totient is φ = 45958752.

The previous prime is 121280399. The next prime is 121280429. The reversal of 121280420 is 24082121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121280392 and 121280401.

It is not an unprimeable number, because it can be changed into a prime (121280429) 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, 159200 + ... + 159959.

It is an arithmetic number, because the mean of its divisors is an integer number (11170600).

Almost surely, 2^121280420 is an apocalyptic number.

121280420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121280420 is an abundant number, since it is smaller than the sum of its proper divisors (146813980).

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

121280420 is a wasteful number, since it uses less digits than its factorization.

121280420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319187 (or 319185 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 121280420 is about 11012.7389871912. The cubic root of 121280420 is about 494.9905381996.

The spelling of 121280420 in words is "one hundred twenty-one million, two hundred eighty thousand, four hundred twenty".