121021112221 has 8 divisors (see below), whose sum is σ = 121941180000. Its totient is φ = 120103755600.

The previous prime is 121021112203. The next prime is 121021112249. The reversal of 121021112221 is 122211120121.

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 121021112221 - 2⁵ = 121021112189 is a prime.

It is a super-2 number, since 2×121021112221² (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 = 121021112195 and 121021112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021112281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588130 + ... + 766771.

It is an arithmetic number, because the mean of its divisors is an integer number (15242647500).

Almost surely, 2^121021112221 is an apocalyptic number.

It is an amenable number.

121021112221 is a deficient number, since it is larger than the sum of its proper divisors (920067779).

121021112221 is a wasteful number, since it uses less digits than its factorization.

121021112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355579.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121021112221 its reverse (122211120121), we get a palindrome (243232232342).

The spelling of 121021112221 in words is "one hundred twenty-one billion, twenty-one million, one hundred twelve thousand, two hundred twenty-one".