121010122021 has 4 divisors (see below), whose sum is σ = 121305990700. Its totient is φ = 120714253344.

The previous prime is 121010121989. The next prime is 121010122027. The reversal of 121010122021 is 120221010121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120221010121 = 199 ⋅604125679.

It can be written as a sum of positive squares in 2 ways, for example, as 115447050625 + 5563071396 = 339775^2 + 74586^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010122021 - 2⁵ = 121010121989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121010121992 and 121010122010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010122027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147933726 + ... + 147934543.

It is an arithmetic number, because the mean of its divisors is an integer number (30326497675).

Almost surely, 2^121010122021 is an apocalyptic number.

It is an amenable number.

121010122021 is a deficient number, since it is larger than the sum of its proper divisors (295868679).

121010122021 is an equidigital number, since it uses as much as digits as its factorization.

121010122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295868678.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121010122021 its reverse (120221010121), we get a palindrome (241231132142).

The spelling of 121010122021 in words is "one hundred twenty-one billion, ten million, one hundred twenty-two thousand, twenty-one".