21201112011111 has 32 divisors (see below), whose sum is σ = 28732603413696. Its totient is φ = 13903695360000.

The previous prime is 21201112011071. The next prime is 21201112011187. The reversal of 21201112011111 is 11111021110212.

It is not a de Polignac number, because 21201112011111 - 2⁷ = 21201112010983 is a prime.

It is a super-2 number, since 2×21201112011111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201112011311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100021701 + ... + 100233441.

It is an arithmetic number, because the mean of its divisors is an integer number (897893856678).

Almost surely, 2^{21201112011111} is an apocalyptic number.

21201112011111 is a deficient number, since it is larger than the sum of its proper divisors (7531491402585).

21201112011111 is a wasteful number, since it uses less digits than its factorization.

21201112011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213923.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21201112011111 its reverse (11111021110212), we get a palindrome (32312133121323).

The spelling of 21201112011111 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, eleven thousand, one hundred eleven".