121201110021 has 8 divisors (see below), whose sum is σ = 161651170720. Its totient is φ = 80775894672.

The previous prime is 121201110011. The next prime is 121201110031. The reversal of 121201110021 is 120011102121.

It is an interprime number because it is at equal distance from previous prime (121201110011) and next prime (121201110031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121201110021 - 2⁵ = 121201109989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201109979 and 121201110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201110011) 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, 6199951 + ... + 6219468.

It is an arithmetic number, because the mean of its divisors is an integer number (20206396340).

Almost surely, 2^121201110021 is an apocalyptic number.

It is an amenable number.

121201110021 is a deficient number, since it is larger than the sum of its proper divisors (40450060699).

121201110021 is a wasteful number, since it uses less digits than its factorization.

121201110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12422675.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121201110021 its reverse (120011102121), we get a palindrome (241212212142).

The spelling of 121201110021 in words is "one hundred twenty-one billion, two hundred one million, one hundred ten thousand, twenty-one".