121142653 has 4 divisors (see below), whose sum is σ = 123959968. Its totient is φ = 118325340.

The previous prime is 121142627. The next prime is 121142677. The reversal of 121142653 is 356241121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 356241121 = 1301 ⋅273821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121142653 is a prime.

It is a super-3 number, since 3×121142653³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121142353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408593 + ... + 1408678.

It is an arithmetic number, because the mean of its divisors is an integer number (30989992).

Almost surely, 2^121142653 is an apocalyptic number.

It is an amenable number.

121142653 is a deficient number, since it is larger than the sum of its proper divisors (2817315).

121142653 is an equidigital number, since it uses as much as digits as its factorization.

121142653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817314.

The product of its digits is 1440, while the sum is 25.

The square root of 121142653 is about 11006.4823172529. The cubic root of 121142653 is about 494.8030410506.

Adding to 121142653 its reverse (356241121), we get a palindrome (477383774).

The spelling of 121142653 in words is "one hundred twenty-one million, one hundred forty-two thousand, six hundred fifty-three".