121010001221 has 4 divisors (see below), whose sum is σ = 121011743244. Its totient is φ = 121008259200.

The previous prime is 121010001197. The next prime is 121010001247. The reversal of 121010001221 is 122100010121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122100010121 = 139 ⋅878417339.

It can be written as a sum of positive squares in 2 ways, for example, as 27137620225 + 93872380996 = 164735^2 + 306386^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010001221 - 2³⁰ = 119936259397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010001121) 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, 762290 + ... + 907251.

It is an arithmetic number, because the mean of its divisors is an integer number (30252935811).

Almost surely, 2^121010001221 is an apocalyptic number.

It is an amenable number.

121010001221 is a deficient number, since it is larger than the sum of its proper divisors (1742023).

121010001221 is an equidigital number, since it uses as much as digits as its factorization.

121010001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742022.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121010001221 its reverse (122100010121), we get a palindrome (243110011342).

The spelling of 121010001221 in words is "one hundred twenty-one billion, ten million, one thousand, two hundred twenty-one".