121345641 has 16 divisors (see below), whose sum is σ = 180028800. Its totient is φ = 80781264.

The previous prime is 121345633. The next prime is 121345649. The reversal of 121345641 is 146543121.

It is a happy number.

121345641 is a `hidden beast` number, since 1 + 2 + 13 + 4 + 5 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (121345633) and next prime (121345649).

It is not a de Polignac number, because 121345641 - 2³ = 121345633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121345649) 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, 18700 + ... + 24338.

It is an arithmetic number, because the mean of its divisors is an integer number (11251800).

Almost surely, 2^121345641 is an apocalyptic number.

It is an amenable number.

121345641 is a deficient number, since it is larger than the sum of its proper divisors (58683159).

121345641 is an equidigital number, since it uses as much as digits as its factorization.

121345641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445 (or 6439 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 121345641 is about 11015.6997508102. The cubic root of 121345641 is about 495.0792526915.

Adding to 121345641 its reverse (146543121), we get a palindrome (267888762).

The spelling of 121345641 in words is "one hundred twenty-one million, three hundred forty-five thousand, six hundred forty-one".