21122002020121 has 4 divisors (see below), whose sum is σ = 21122011387600. Its totient is φ = 21121992652644.

The previous prime is 21122002020109. The next prime is 21122002020191. The reversal of 21122002020121 is 12102020022112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21122002020121 - 2⁵ = 21122002020089 is a prime.

It is a super-2 number, since 2×21122002020121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122002020095 and 21122002020104.

It is not an unprimeable number, because it can be changed into a prime (21122002020191) 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, 987370 + ... + 6574108.

It is an arithmetic number, because the mean of its divisors is an integer number (5280502846900).

Almost surely, 2^{21122002020121} is an apocalyptic number.

It is an amenable number.

21122002020121 is a deficient number, since it is larger than the sum of its proper divisors (9367479).

21122002020121 is an equidigital number, since it uses as much as digits as its factorization.

21122002020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9367478.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21122002020121 its reverse (12102020022112), we get a palindrome (33224022042233).

The spelling of 21122002020121 in words is "twenty-one trillion, one hundred twenty-two billion, two million, twenty thousand, one hundred twenty-one".