21112220111001 has 8 divisors (see below), whose sum is σ = 28546100432064. Its totient is φ = 13876576598640.

The previous prime is 21112220110963. The next prime is 21112220111023. The reversal of 21112220111001 is 10011102221112.

It is a happy number.

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

It is not a de Polignac number, because 21112220111001 - 2¹⁹ = 21112219586713 is a prime.

It is a super-2 number, since 2×21112220111001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21112220111701) 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, 49559201926 + ... + 49559202351.

It is an arithmetic number, because the mean of its divisors is an integer number (3568262554008).

Almost surely, 2^{21112220111001} is an apocalyptic number.

It is an amenable number.

21112220111001 is a deficient number, since it is larger than the sum of its proper divisors (7433880321063).

21112220111001 is an equidigital number, since it uses as much as digits as its factorization.

21112220111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99118404351.

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

Adding to 21112220111001 its reverse (10011102221112), we get a palindrome (31123322332113).

The spelling of 21112220111001 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, one hundred eleven thousand, one".