121215340 has 24 divisors (see below), whose sum is σ = 255123792. Its totient is φ = 48377280.

The previous prime is 121215317. The next prime is 121215343. The reversal of 121215340 is 43512121.

It is not an unprimeable number, because it can be changed into a prime (121215343) 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, 2647 + ... + 15793.

It is an arithmetic number, because the mean of its divisors is an integer number (10630158).

Almost surely, 2^121215340 is an apocalyptic number.

121215340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121215340 is an abundant number, since it is smaller than the sum of its proper divisors (133908452).

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

121215340 is a wasteful number, since it uses less digits than its factorization.

121215340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13617 (or 13615 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 121215340 is about 11009.7838307571. The cubic root of 121215340 is about 494.9019837898.

Adding to 121215340 its reverse (43512121), we get a palindrome (164727461).

The spelling of 121215340 in words is "one hundred twenty-one million, two hundred fifteen thousand, three hundred forty".