121240 has 32 divisors (see below), whose sum is σ = 312480. Its totient is φ = 41472.

The previous prime is 121229. The next prime is 121259. The reversal of 121240 is 42121.

121240 = T₅₇ + T₅₈ + ... + T₉₆.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64 + ... + 496.

It is an arithmetic number, because the mean of its divisors is an integer number (9765).

2¹²¹²⁴⁰ is an apocalyptic number.

121240 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 121240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156240).

121240 is an abundant number, since it is smaller than the sum of its proper divisors (191240).

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

121240 is a wasteful number, since it uses less digits than its factorization.

121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 447 counting only the distinct ones).

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

The square root of 121240 is about 348.1953474704. The cubic root of 121240 is about 49.4935542401.

Adding to 121240 its reverse (42121), we get a palindrome (163361).

It can be divided in two parts, 121 and 240, that added together give a square (361 = 19²).

The spelling of 121240 in words is "one hundred twenty-one thousand, two hundred forty", and thus it is an iban number.