21201020101211 has 16 divisors (see below), whose sum is σ = 22675239089568. Its totient is φ = 19752118848000.

The previous prime is 21201020101207. The next prime is 21201020101259. The reversal of 21201020101211 is 11210102010212.

It is not a de Polignac number, because 21201020101211 - 2² = 21201020101207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201020101201) 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, 6738341 + ... + 9370553.

It is an arithmetic number, because the mean of its divisors is an integer number (1417202443098).

Almost surely, 2^{21201020101211} is an apocalyptic number.

21201020101211 is a deficient number, since it is larger than the sum of its proper divisors (1474218988357).

21201020101211 is a wasteful number, since it uses less digits than its factorization.

21201020101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201020101211 its reverse (11210102010212), we get a palindrome (32411122111423).

The spelling of 21201020101211 in words is "twenty-one trillion, two hundred one billion, twenty million, one hundred one thousand, two hundred eleven".