10121222221021 has 4 divisors (see below), whose sum is σ = 10234943819100. Its totient is φ = 10007500622944.

The previous prime is 10121222221009. The next prime is 10121222221043. The reversal of 10121222221021 is 12012222212101.

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 1738141644996 + 8383080576025 = 1318386^2 + 2895355^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121222221021 - 2⁴¹ = 7922198965469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10121222221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121222221921) 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, 56860798906 + ... + 56860799083.

It is an arithmetic number, because the mean of its divisors is an integer number (2558735954775).

Almost surely, 2^{10121222221021} is an apocalyptic number.

It is an amenable number.

10121222221021 is a deficient number, since it is larger than the sum of its proper divisors (113721598079).

10121222221021 is an equidigital number, since it uses as much as digits as its factorization.

10121222221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113721598078.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 10121222221021 its reverse (12012222212101), we get a palindrome (22133444433122).

The spelling of 10121222221021 in words is "ten trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".