21222220100011 has 4 divisors (see below), whose sum is σ = 24253965828592. Its totient is φ = 18190474371432.

The previous prime is 21222220099979. The next prime is 21222220100023. The reversal of 21222220100011 is 11000102222212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222220100011 - 2⁵ = 21222220099979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222220100041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515872864280 + ... + 1515872864293.

It is an arithmetic number, because the mean of its divisors is an integer number (6063491457148).

Almost surely, 2^{21222220100011} is an apocalyptic number.

21222220100011 is a deficient number, since it is larger than the sum of its proper divisors (3031745728581).

21222220100011 is an equidigital number, since it uses as much as digits as its factorization.

21222220100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031745728580.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222220100011 its reverse (11000102222212), we get a palindrome (32222322322223).

The spelling of 21222220100011 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, one hundred thousand, eleven".