121340342021 has 4 divisors (see below), whose sum is σ = 121915414944. Its totient is φ = 120765269100.

The previous prime is 121340341979. The next prime is 121340342041. The reversal of 121340342021 is 120243043121.

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: 120243043121 = 1481 ⋅81190441.

It is a cyclic number.

It is not a de Polignac number, because 121340342021 - 2¹⁰ = 121340340997 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 (121340342041) 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, 287536145 + ... + 287536566.

It is an arithmetic number, because the mean of its divisors is an integer number (30478853736).

Almost surely, 2^121340342021 is an apocalyptic number.

It is an amenable number.

121340342021 is a deficient number, since it is larger than the sum of its proper divisors (575072923).

121340342021 is an equidigital number, since it uses as much as digits as its factorization.

121340342021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575072922.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 121340342021 its reverse (120243043121), we get a palindrome (241583385142).

The spelling of 121340342021 in words is "one hundred twenty-one billion, three hundred forty million, three hundred forty-two thousand, twenty-one".