121011110021 has 4 divisors (see below), whose sum is σ = 121015236492. Its totient is φ = 121006983552.

The previous prime is 121011109987. The next prime is 121011110039. The reversal of 121011110021 is 120011110121.

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 33031245025 + 87979864996 = 181745^2 + 296614^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011110021 - 2¹⁰ = 121011108997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121011109984 and 121011110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011110321) 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, 2018930 + ... + 2078003.

It is an arithmetic number, because the mean of its divisors is an integer number (30253809123).

Almost surely, 2^121011110021 is an apocalyptic number.

It is an amenable number.

121011110021 is a deficient number, since it is larger than the sum of its proper divisors (4126471).

121011110021 is an equidigital number, since it uses as much as digits as its factorization.

121011110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126470.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121011110021 its reverse (120011110121), we get a palindrome (241022220142).

The spelling of 121011110021 in words is "one hundred twenty-one billion, eleven million, one hundred ten thousand, twenty-one".