121001220110021 has 4 divisors (see below), whose sum is σ = 121700649128172. Its totient is φ = 120301791091872.

The previous prime is 121001220109981. The next prime is 121001220110059. The reversal of 121001220110021 is 120011022100121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93378690460225 + 27622529649796 = 9663265^2 + 5255714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121001220110021 is a prime.

It is a super-2 number, since 2×121001220110021² (a number of 29 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 = 121001220109978 and 121001220110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001220110521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349714508816 + ... + 349714509161.

It is an arithmetic number, because the mean of its divisors is an integer number (30425162282043).

Almost surely, 2^{121001220110021} is an apocalyptic number.

It is an amenable number.

121001220110021 is a deficient number, since it is larger than the sum of its proper divisors (699429018151).

121001220110021 is an equidigital number, since it uses as much as digits as its factorization.

121001220110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699429018150.

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

Adding to 121001220110021 its reverse (120011022100121), we get a palindrome (241012242210142).

The spelling of 121001220110021 in words is "one hundred twenty-one trillion, one billion, two hundred twenty million, one hundred ten thousand, twenty-one".