21022102120121 has 4 divisors (see below), whose sum is σ = 21025481342244. Its totient is φ = 21018722898000.

The previous prime is 21022102120037. The next prime is 21022102120139. The reversal of 21022102120121 is 12102120122012.

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 9950012244496 + 11072089875625 = 3154364^2 + 3327475^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022102120121 - 2¹⁰ = 21022102119097 is a prime.

It is a super-2 number, since 2×21022102120121² (a number of 27 digits) contains 22 as substring.

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 21022102120121.

It is not an unprimeable number, because it can be changed into a prime (21022102120141) 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, 1689601730 + ... + 1689614171.

It is an arithmetic number, because the mean of its divisors is an integer number (5256370335561).

Almost surely, 2^{21022102120121} is an apocalyptic number.

It is an amenable number.

21022102120121 is a deficient number, since it is larger than the sum of its proper divisors (3379222123).

21022102120121 is an equidigital number, since it uses as much as digits as its factorization.

21022102120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379222122.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21022102120121 its reverse (12102120122012), we get a palindrome (33124222242133).

The spelling of 21022102120121 in words is "twenty-one trillion, twenty-two billion, one hundred two million, one hundred twenty thousand, one hundred twenty-one".