121421140 has 48 divisors (see below), whose sum is σ = 281740032. Its totient is φ = 43721216.

The previous prime is 121421137. The next prime is 121421159. The reversal of 121421140 is 41124121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57 + ... + 15583.

It is an arithmetic number, because the mean of its divisors is an integer number (5869584).

Almost surely, 2^121421140 is an apocalyptic number.

121421140 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 121421140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140870016).

121421140 is an abundant number, since it is smaller than the sum of its proper divisors (160318892).

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

121421140 is a wasteful number, since it uses less digits than its factorization.

121421140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15576 (or 15574 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 121421140 is about 11019.1260996506. The cubic root of 121421140 is about 495.1819077709.

Adding to 121421140 its reverse (41124121), we get a palindrome (162545261).

The spelling of 121421140 in words is "one hundred twenty-one million, four hundred twenty-one thousand, one hundred forty".