121221101021 has 8 divisors (see below), whose sum is σ = 124145561088. Its totient is φ = 118330450000.

The previous prime is 121221101011. The next prime is 121221101041. The reversal of 121221101021 is 120101122121.

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 121221101021 - 2¹⁴ = 121221084637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221100987 and 121221101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221101011) 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, 8445005 + ... + 8459346.

It is an arithmetic number, because the mean of its divisors is an integer number (15518195136).

Almost surely, 2^121221101021 is an apocalyptic number.

It is an amenable number.

121221101021 is a deficient number, since it is larger than the sum of its proper divisors (2924460067).

121221101021 is a wasteful number, since it uses less digits than its factorization.

121221101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16904523.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221101021 its reverse (120101122121), we get a palindrome (241322223142).

The spelling of 121221101021 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, twenty-one".