121420 has 24 divisors (see below), whose sum is σ = 275184. Its totient is φ = 44736.

The previous prime is 121403. The next prime is 121421. The reversal of 121420 is 24121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121397 and 121406.

It is not an unprimeable number, because it can be changed into a prime (121421) 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, 27 + ... + 493.

It is an arithmetic number, because the mean of its divisors is an integer number (11466).

2¹²¹⁴²⁰ is an apocalyptic number.

121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137592).

121420 is an abundant number, since it is smaller than the sum of its proper divisors (153764).

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

121420 is a wasteful number, since it uses less digits than its factorization.

121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 121420 is about 348.4537272006. The cubic root of 121420 is about 49.5180358043.

Adding to 121420 its reverse (24121), we get a palindrome (145541).

The spelling of 121420 in words is "one hundred twenty-one thousand, four hundred twenty", and thus it is an iban number.