21201111112011 has 8 divisors (see below), whose sum is σ = 28291000335504. Its totient is φ = 14122647981600.

The previous prime is 21201111112007. The next prime is 21201111112021. The reversal of 21201111112011 is 11021111110212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201111112011 - 2² = 21201111112007 is a prime.

It is a super-2 number, since 2×21201111112011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201111112021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2856518940 + ... + 2856526361.

It is an arithmetic number, because the mean of its divisors is an integer number (3536375041938).

Almost surely, 2^{21201111112011} is an apocalyptic number.

21201111112011 is a deficient number, since it is larger than the sum of its proper divisors (7089889223493).

21201111112011 is a wasteful number, since it uses less digits than its factorization.

21201111112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713046541.

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

Adding to 21201111112011 its reverse (11021111110212), we get a palindrome (32222222222223).

The spelling of 21201111112011 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, one hundred twelve thousand, eleven".