121341525421 has 4 divisors (see below), whose sum is σ = 123003738172. Its totient is φ = 119679312672.

The previous prime is 121341525317. The next prime is 121341525427. The reversal of 121341525421 is 124525143121.

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 71214793321 + 50126732100 = 266861^2 + 223890^2 .

It is a cyclic number.

It is not a de Polignac number, because 121341525421 - 2²⁵ = 121307970989 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 (121341525427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831106266 + ... + 831106411.

It is an arithmetic number, because the mean of its divisors is an integer number (30750934543).

Almost surely, 2^121341525421 is an apocalyptic number.

It is an amenable number.

121341525421 is a deficient number, since it is larger than the sum of its proper divisors (1662212751).

121341525421 is an equidigital number, since it uses as much as digits as its factorization.

121341525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662212750.

The product of its digits is 9600, while the sum is 31.

Adding to 121341525421 its reverse (124525143121), we get a palindrome (245866668542).

The spelling of 121341525421 in words is "one hundred twenty-one billion, three hundred forty-one million, five hundred twenty-five thousand, four hundred twenty-one".