121312653 has 16 divisors (see below), whose sum is σ = 201662976. Its totient is φ = 63019440.

The previous prime is 121312643. The next prime is 121312657. The reversal of 121312653 is 356213121.

It is not a de Polignac number, because 121312653 - 2⁹ = 121312141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312657) 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, 262351 + ... + 262812.

It is an arithmetic number, because the mean of its divisors is an integer number (12603936).

Almost surely, 2^121312653 is an apocalyptic number.

It is an amenable number.

121312653 is a deficient number, since it is larger than the sum of its proper divisors (80350323).

121312653 is a wasteful number, since it uses less digits than its factorization.

121312653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525184.

The product of its digits is 1080, while the sum is 24.

The square root of 121312653 is about 11014.2023315354. The cubic root of 121312653 is about 495.0343859390.

Adding to 121312653 its reverse (356213121), we get a palindrome (477525774).

The spelling of 121312653 in words is "one hundred twenty-one million, three hundred twelve thousand, six hundred fifty-three".