21216211606022 has 16 divisors (see below), whose sum is σ = 31868703711792. Its totient is φ = 10593312616320.

The previous prime is 21216211606003. The next prime is 21216211606043. The reversal of 21216211606022 is 22060611261212.

It is a super-2 number, since 2×21216211606022² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21216211606022.

It is a congruent number.

It is an unprimeable number.

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, 18550433 + ... + 19660899.

It is an arithmetic number, because the mean of its divisors is an integer number (1991793981987).

Almost surely, 2^{21216211606022} is an apocalyptic number.

21216211606022 is a deficient number, since it is larger than the sum of its proper divisors (10652492105770).

21216211606022 is a wasteful number, since it uses less digits than its factorization.

21216211606022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123783.

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 21216211606022 its reverse (22060611261212), we get a palindrome (43276822867234).

The spelling of 21216211606022 in words is "twenty-one trillion, two hundred sixteen billion, two hundred eleven million, six hundred six thousand, twenty-two".