121321223021 has 16 divisors (see below), whose sum is σ = 125877628800. Its totient is φ = 116790072000.

The previous prime is 121321223017. The next prime is 121321223047. The reversal of 121321223021 is 120322123121.

It is a cyclic number.

It is not a de Polignac number, because 121321223021 - 2² = 121321223017 is a prime.

It is a super-2 number, since 2×121321223021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121321222984 and 121321223002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321223921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27254846 + ... + 27259296.

It is an arithmetic number, because the mean of its divisors is an integer number (7867351800).

Almost surely, 2^121321223021 is an apocalyptic number.

It is an amenable number.

121321223021 is a deficient number, since it is larger than the sum of its proper divisors (4556405779).

121321223021 is a wasteful number, since it uses less digits than its factorization.

121321223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 121321223021 its reverse (120322123121), we get a palindrome (241643346142).

The spelling of 121321223021 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-three thousand, twenty-one".