110121102100021 has 4 divisors (see below), whose sum is σ = 110860169899500. Its totient is φ = 109382034300544.

The previous prime is 110121102099991. The next prime is 110121102100039. The reversal of 110121102100021 is 120001201121011.

It is a happy number.

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 13169016819396 + 96952085280625 = 3628914^2 + 9846425^2 .

It is a cyclic number.

It is not a de Polignac number, because 110121102100021 - 2¹³ = 110121102091829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 110121102099974 and 110121102100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110121102100921) 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, 369533899516 + ... + 369533899813.

It is an arithmetic number, because the mean of its divisors is an integer number (27715042474875).

Almost surely, 2^{110121102100021} is an apocalyptic number.

It is an amenable number.

110121102100021 is a deficient number, since it is larger than the sum of its proper divisors (739067799479).

110121102100021 is an equidigital number, since it uses as much as digits as its factorization.

110121102100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739067799478.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 110121102100021 its reverse (120001201121011), we get a palindrome (230122303221032).

The spelling of 110121102100021 in words is "one hundred ten trillion, one hundred twenty-one billion, one hundred two million, one hundred thousand, twenty-one".