121223140 has 12 divisors (see below), whose sum is σ = 254568636. Its totient is φ = 48489248.

The previous prime is 121223117. The next prime is 121223147. The reversal of 121223140 is 41322121.

It can be written as a sum of positive squares in 2 ways, for example, as 63584676 + 57638464 = 7974^2 + 7592^2 .

It is not an unprimeable number, because it can be changed into a prime (121223147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030559 + ... + 3030598.

It is an arithmetic number, because the mean of its divisors is an integer number (21214053).

Almost surely, 2^121223140 is an apocalyptic number.

121223140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121223140 is an abundant number, since it is smaller than the sum of its proper divisors (133345496).

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

121223140 is a wasteful number, since it uses less digits than its factorization.

121223140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061166 (or 6061164 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121223140 is about 11010.1380554469. The cubic root of 121223140 is about 494.9125989278.

Adding to 121223140 its reverse (41322121), we get a palindrome (162545261).

The spelling of 121223140 in words is "one hundred twenty-one million, two hundred twenty-three thousand, one hundred forty".