121011021 has 12 divisors (see below), whose sum is σ = 174893472. Its totient is φ = 80627976.

The previous prime is 121011017. The next prime is 121011043. The reversal of 121011021 is 120110121.

It is a happy number.

It is not a de Polignac number, because 121011021 - 2² = 121011017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121010994 and 121011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011071) 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 11 ways as a sum of consecutive naturals, for example, 21880 + ... + 26846.

It is an arithmetic number, because the mean of its divisors is an integer number (14574456).

Almost surely, 2^121011021 is an apocalyptic number.

It is an amenable number.

121011021 is a deficient number, since it is larger than the sum of its proper divisors (53882451).

121011021 is a wasteful number, since it uses less digits than its factorization.

121011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7680 (or 7677 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 121011021 is about 11000.5009431389. The cubic root of 121011021 is about 494.6237606265.

Adding to 121011021 its reverse (120110121), we get a palindrome (241121142).

The spelling of 121011021 in words is "one hundred twenty-one million, eleven thousand, twenty-one".