121909140 has 72 divisors (see below), whose sum is σ = 370974240. Its totient is φ = 32405184.

The previous prime is 121909133. The next prime is 121909147. The reversal of 121909140 is 41909121.

It is an interprime number because it is at equal distance from previous prime (121909133) and next prime (121909147).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121909147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67327 + ... + 69113.

It is an arithmetic number, because the mean of its divisors is an integer number (5152420).

Almost surely, 2^121909140 is an apocalyptic number.

121909140 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 121909140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185487120).

121909140 is an abundant number, since it is smaller than the sum of its proper divisors (249065100).

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

121909140 is a wasteful number, since it uses less digits than its factorization.

121909140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 121909140 is about 11041.2472121586. The cubic root of 121909140 is about 495.8444111798.

The spelling of 121909140 in words is "one hundred twenty-one million, nine hundred nine thousand, one hundred forty".