121330021 has 4 divisors (see below), whose sum is σ = 122403852. Its totient is φ = 120256192.

The previous prime is 121329977. The next prime is 121330031. The reversal of 121330021 is 120033121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120033121 = 13 ⋅9233317.

It can be written as a sum of positive squares in 2 ways, for example, as 8673025 + 112656996 = 2945^2 + 10614^2 .

It is a cyclic number.

It is not a de Polignac number, because 121330021 - 2⁷ = 121329893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121329983 and 121330010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121330031) 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, 536746 + ... + 536971.

It is an arithmetic number, because the mean of its divisors is an integer number (30600963).

Almost surely, 2^121330021 is an apocalyptic number.

It is an amenable number.

121330021 is a deficient number, since it is larger than the sum of its proper divisors (1073831).

121330021 is a wasteful number, since it uses less digits than its factorization.

121330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073830.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 121330021 is about 11014.9907398962. The cubic root of 121330021 is about 495.0580090504.

Adding to 121330021 its reverse (120033121), we get a palindrome (241363142).

The spelling of 121330021 in words is "one hundred twenty-one million, three hundred thirty thousand, twenty-one".