121330313021 has 4 divisors (see below), whose sum is σ = 121331228700. Its totient is φ = 121329397344.

The previous prime is 121330313011. The next prime is 121330313053. The reversal of 121330313021 is 120313033121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36773815225 + 84556497796 = 191765^2 + 290786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121330313021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121330312984 and 121330313002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121330313011) 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, 216776 + ... + 538193.

It is an arithmetic number, because the mean of its divisors is an integer number (30332807175).

Almost surely, 2^121330313021 is an apocalyptic number.

It is an amenable number.

121330313021 is a deficient number, since it is larger than the sum of its proper divisors (915679).

121330313021 is an equidigital number, since it uses as much as digits as its factorization.

121330313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915678.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 121330313021 its reverse (120313033121), we get a palindrome (241643346142).

The spelling of 121330313021 in words is "one hundred twenty-one billion, three hundred thirty million, three hundred thirteen thousand, twenty-one".