21020121200211 has 16 divisors (see below), whose sum is σ = 32082406713600. Its totient is φ = 11992093139808.

The previous prime is 21020121200131. The next prime is 21020121200257. The reversal of 21020121200211 is 11200212102012.

It is not a de Polignac number, because 21020121200211 - 2⁹ = 21020121199699 is a prime.

It is a super-2 number, since 2×21020121200211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020121200411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 808515396 + ... + 808541393.

It is an arithmetic number, because the mean of its divisors is an integer number (2005150419600).

Almost surely, 2^{21020121200211} is an apocalyptic number.

21020121200211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21020121200211 is a deficient number, since it is larger than the sum of its proper divisors (11062285513389).

21020121200211 is a wasteful number, since it uses less digits than its factorization.

21020121200211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617057418.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020121200211 its reverse (11200212102012), we get a palindrome (32220333302223).

The spelling of 21020121200211 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred thousand, two hundred eleven".