121365641 has 4 divisors (see below), whose sum is σ = 126642432. Its totient is φ = 116088852.

The previous prime is 121365637. The next prime is 121365653. The reversal of 121365641 is 146563121.

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: 146563121 = 181 ⋅809741.

It is a cyclic number.

It is not a de Polignac number, because 121365641 - 2² = 121365637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121365691) 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, 2638361 + ... + 2638406.

It is an arithmetic number, because the mean of its divisors is an integer number (31660608).

Almost surely, 2^121365641 is an apocalyptic number.

It is an amenable number.

121365641 is a deficient number, since it is larger than the sum of its proper divisors (5276791).

121365641 is an equidigital number, since it uses as much as digits as its factorization.

121365641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276790.

The product of its digits is 4320, while the sum is 29.

The square root of 121365641 is about 11016.6075086662. The cubic root of 121365641 is about 495.1064505951.

The spelling of 121365641 in words is "one hundred twenty-one million, three hundred sixty-five thousand, six hundred forty-one".