121210065 has 24 divisors (see below), whose sum is σ = 211641768. Its totient is φ = 64170240.

The previous prime is 121210049. The next prime is 121210081. The reversal of 121210065 is 560012121.

It is an interprime number because it is at equal distance from previous prime (121210049) and next prime (121210081).

It can be written as a sum of positive squares in 4 ways, for example, as 17842176 + 103367889 = 4224^2 + 10167^2 .

It is not a de Polignac number, because 121210065 - 2⁴ = 121210049 is a prime.

It is an unprimeable number.

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, 3666 + ... + 15995.

It is an arithmetic number, because the mean of its divisors is an integer number (8818407).

Almost surely, 2^121210065 is an apocalyptic number.

121210065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121210065 is a deficient number, since it is larger than the sum of its proper divisors (90431703).

121210065 is a wasteful number, since it uses less digits than its factorization.

121210065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19809 (or 19806 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 121210065 is about 11009.5442684972. The cubic root of 121210065 is about 494.8948047044.

Adding to 121210065 its reverse (560012121), we get a palindrome (681222186).

The spelling of 121210065 in words is "one hundred twenty-one million, two hundred ten thousand, sixty-five".