21220201020111 has 64 divisors (see below), whose sum is σ = 32589688089600. Its totient is φ = 12207917804544.

The previous prime is 21220201020107. The next prime is 21220201020163. The reversal of 21220201020111 is 11102010202212.

It is not a de Polignac number, because 21220201020111 - 2² = 21220201020107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220201020211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1047540 + ... + 6598313.

It is an arithmetic number, because the mean of its divisors is an integer number (509213876400).

Almost surely, 2^{21220201020111} is an apocalyptic number.

21220201020111 is a deficient number, since it is larger than the sum of its proper divisors (11369487069489).

21220201020111 is a wasteful number, since it uses less digits than its factorization.

21220201020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7646000.

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

Adding to 21220201020111 its reverse (11102010202212), we get a palindrome (32322211222323).

The spelling of 21220201020111 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, twenty thousand, one hundred eleven".