121440427 has 4 divisors (see below), whose sum is σ = 121462936. Its totient is φ = 121417920.

The previous prime is 121440421. The next prime is 121440463. The reversal of 121440427 is 724044121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724044121 = 4789 ⋅151189.

It is a cyclic number.

It is not a de Polignac number, because 121440427 - 2¹⁹ = 120916139 is a prime.

It is a super-3 number, since 3×121440427³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121440421) 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, 2203 + ... + 15739.

It is an arithmetic number, because the mean of its divisors is an integer number (30365734).

Almost surely, 2^121440427 is an apocalyptic number.

121440427 is a deficient number, since it is larger than the sum of its proper divisors (22509).

121440427 is an equidigital number, since it uses as much as digits as its factorization.

121440427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22508.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 121440427 is about 11020.0012250453. The cubic root of 121440427 is about 495.2081252478.

Adding to 121440427 its reverse (724044121), we get a palindrome (845484548).

The spelling of 121440427 in words is "one hundred twenty-one million, four hundred forty thousand, four hundred twenty-seven".