21022001211111 has 64 divisors (see below), whose sum is σ = 30499225436160. Its totient is φ = 12846730533120.

The previous prime is 21022001211083. The next prime is 21022001211119. The reversal of 21022001211111 is 11111210022012.

It is a happy number.

It is not a de Polignac number, because 21022001211111 - 2⁶ = 21022001211047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022001211119) 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 63 ways as a sum of consecutive naturals, for example, 29375016 + ... + 30082146.

It is an arithmetic number, because the mean of its divisors is an integer number (476550397440).

Almost surely, 2^{21022001211111} is an apocalyptic number.

21022001211111 is a deficient number, since it is larger than the sum of its proper divisors (9477224225049).

21022001211111 is a wasteful number, since it uses less digits than its factorization.

21022001211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707396.

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

Adding to 21022001211111 its reverse (11111210022012), we get a palindrome (32133211233123).

The spelling of 21022001211111 in words is "twenty-one trillion, twenty-two billion, one million, two hundred eleven thousand, one hundred eleven".