121328413 has 4 divisors (see below), whose sum is σ = 124150048. Its totient is φ = 118506780.

The previous prime is 121328399. The next prime is 121328419. The reversal of 121328413 is 314823121.

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: 314823121 = 37 ⋅8508733.

It is a cyclic number.

It is not a de Polignac number, because 121328413 - 2¹⁷ = 121197341 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 (121328419) 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, 1410753 + ... + 1410838.

It is an arithmetic number, because the mean of its divisors is an integer number (31037512).

Almost surely, 2^121328413 is an apocalyptic number.

It is an amenable number.

121328413 is a deficient number, since it is larger than the sum of its proper divisors (2821635).

121328413 is an equidigital number, since it uses as much as digits as its factorization.

121328413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821634.

The product of its digits is 1152, while the sum is 25.

The square root of 121328413 is about 11014.9177482176. The cubic root of 121328413 is about 495.0558220215.

The spelling of 121328413 in words is "one hundred twenty-one million, three hundred twenty-eight thousand, four hundred thirteen".