121330421 has 4 divisors (see below), whose sum is σ = 121744812. Its totient is φ = 120916032.

The previous prime is 121330397. The next prime is 121330423. The reversal of 121330421 is 124033121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114725521 + 6604900 = 10711^2 + 2570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121330421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121330421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121330423) 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, 206756 + ... + 207341.

It is an arithmetic number, because the mean of its divisors is an integer number (30436203).

Almost surely, 2^121330421 is an apocalyptic number.

It is an amenable number.

121330421 is a deficient number, since it is larger than the sum of its proper divisors (414391).

121330421 is an equidigital number, since it uses as much as digits as its factorization.

121330421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414390.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 121330421 is about 11015.0088969551. The cubic root of 121330421 is about 495.0585530844.

Adding to 121330421 its reverse (124033121), we get a palindrome (245363542).

The spelling of 121330421 in words is "one hundred twenty-one million, three hundred thirty thousand, four hundred twenty-one".