121365421 has 4 divisors (see below), whose sum is σ = 123947712. Its totient is φ = 118783132.

The previous prime is 121365383. The next prime is 121365427. The reversal of 121365421 is 124563121.

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: 124563121 = 2579 ⋅48299.

It is a cyclic number.

It is not a de Polignac number, because 121365421 - 2¹¹ = 121363373 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 (121365427) 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, 1291075 + ... + 1291168.

It is an arithmetic number, because the mean of its divisors is an integer number (30986928).

Almost surely, 2^121365421 is an apocalyptic number.

It is an amenable number.

121365421 is a deficient number, since it is larger than the sum of its proper divisors (2582291).

121365421 is an equidigital number, since it uses as much as digits as its factorization.

121365421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582290.

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

The square root of 121365421 is about 11016.5975237366. The cubic root of 121365421 is about 495.1061514344.

The spelling of 121365421 in words is "one hundred twenty-one million, three hundred sixty-five thousand, four hundred twenty-one".