121221023 has 16 divisors (see below), whose sum is σ = 153394944. Its totient is φ = 93044160.

The previous prime is 121221019. The next prime is 121221029. The reversal of 121221023 is 320122121.

It is a happy number.

It is not a de Polignac number, because 121221023 - 2² = 121221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220989 and 121221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6590 + ... + 16907.

It is an arithmetic number, because the mean of its divisors is an integer number (9587184).

Almost surely, 2^121221023 is an apocalyptic number.

121221023 is a deficient number, since it is larger than the sum of its proper divisors (32173921).

121221023 is a wasteful number, since it uses less digits than its factorization.

121221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23582.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121221023 is about 11010.0419163598. The cubic root of 121221023 is about 494.9097179155.

Adding to 121221023 its reverse (320122121), we get a palindrome (441343144).

The spelling of 121221023 in words is "one hundred twenty-one million, two hundred twenty-one thousand, twenty-three".