121121021 has 8 divisors (see below), whose sum is σ = 141369600. Its totient is φ = 101608848.

The previous prime is 121121003. The next prime is 121121083. The reversal of 121121021 is 120121121.

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 121121021 - 2¹⁸ = 120858877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121120993 and 121121011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183746 + ... + 184403.

It is an arithmetic number, because the mean of its divisors is an integer number (17671200).

Almost surely, 2^121121021 is an apocalyptic number.

It is an amenable number.

121121021 is a deficient number, since it is larger than the sum of its proper divisors (20248579).

121121021 is an equidigital number, since it uses as much as digits as its factorization.

121121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368203.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121121021 is about 11005.4995797556. The cubic root of 121121021 is about 494.7735875750.

Adding to 121121021 its reverse (120121121), we get a palindrome (241242142).

The spelling of 121121021 in words is "one hundred twenty-one million, one hundred twenty-one thousand, twenty-one".