21210120101121 has 16 divisors (see below), whose sum is σ = 32321056560000. Its totient is φ = 12119741048448.

The previous prime is 21210120101099. The next prime is 21210120101167. The reversal of 21210120101121 is 12110102101212.

It is a happy number.

It is not a de Polignac number, because 21210120101121 - 2¹³ = 21210120092929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210120101121.

It is not an unprimeable number, because it can be changed into a prime (21210120101921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12852646 + ... + 14408703.

It is an arithmetic number, because the mean of its divisors is an integer number (2020066035000).

Almost surely, 2^{21210120101121} is an apocalyptic number.

21210120101121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21210120101121 is a deficient number, since it is larger than the sum of its proper divisors (11110936458879).

21210120101121 is a wasteful number, since it uses less digits than its factorization.

21210120101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27298408.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210120101121 its reverse (12110102101212), we get a palindrome (33320222202333).

The spelling of 21210120101121 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred one thousand, one hundred twenty-one".