121331021 has 8 divisors (see below), whose sum is σ = 139723584. Its totient is φ = 103203360.

The previous prime is 121330999. The next prime is 121331027. The reversal of 121331021 is 120133121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121331021 - 2¹⁴ = 121314637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121330987 and 121331005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121331027) 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 7 ways as a sum of consecutive naturals, for example, 65240 + ... + 67073.

It is an arithmetic number, because the mean of its divisors is an integer number (17465448).

Almost surely, 2^121331021 is an apocalyptic number.

It is an amenable number.

121331021 is a deficient number, since it is larger than the sum of its proper divisors (18392563).

121331021 is a wasteful number, since it uses less digits than its factorization.

121331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132451.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 121331021 is about 11015.0361324873. The cubic root of 121331021 is about 495.0593691332.

Adding to 121331021 its reverse (120133121), we get a palindrome (241464142).

The spelling of 121331021 in words is "one hundred twenty-one million, three hundred thirty-one thousand, twenty-one".