121665103 has 16 divisors (see below), whose sum is σ = 144308736. Its totient is φ = 100406880.

The previous prime is 121665097. The next prime is 121665119. The reversal of 121665103 is 301566121.

It is not a de Polignac number, because 121665103 - 2⁹ = 121664591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121665143) 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, 18525 + ... + 24217.

It is an arithmetic number, because the mean of its divisors is an integer number (9019296).

Almost surely, 2^121665103 is an apocalyptic number.

121665103 is a deficient number, since it is larger than the sum of its proper divisors (22643633).

121665103 is an equidigital number, since it uses as much as digits as its factorization.

121665103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5814.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 121665103 is about 11030.1905241931. The cubic root of 121665103 is about 495.5133306870.

The spelling of 121665103 in words is "one hundred twenty-one million, six hundred sixty-five thousand, one hundred three".