121340565 has 16 divisors (see below), whose sum is σ = 215716800. Its totient is φ = 64714896.

The previous prime is 121340561. The next prime is 121340579. The reversal of 121340565 is 565043121.

It is not a de Polignac number, because 121340565 - 2² = 121340561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121340561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449275 + ... + 449544.

It is an arithmetic number, because the mean of its divisors is an integer number (13482300).

Almost surely, 2^121340565 is an apocalyptic number.

121340565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121340565 is a deficient number, since it is larger than the sum of its proper divisors (94376235).

121340565 is an equidigital number, since it uses as much as digits as its factorization.

121340565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898833 (or 898827 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 121340565 is about 11015.4693499642. The cubic root of 121340565 is about 495.0723493881.

Adding to 121340565 its reverse (565043121), we get a palindrome (686383686).

The spelling of 121340565 in words is "one hundred twenty-one million, three hundred forty thousand, five hundred sixty-five".