21361222112 has 24 divisors (see below), whose sum is σ = 44268323400. Its totient is φ = 10118473344.

The previous prime is 21361222087. The next prime is 21361222117. The reversal of 21361222112 is 21122216312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361222117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17566187 + ... + 17567402.

It is an arithmetic number, because the mean of its divisors is an integer number (1844513475).

Almost surely, 2^21361222112 is an apocalyptic number.

It is an amenable number.

21361222112 is an abundant number, since it is smaller than the sum of its proper divisors (22907101288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361222112 is a wasteful number, since it uses less digits than its factorization.

21361222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35133618 (or 35133610 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

Adding to 21361222112 its reverse (21122216312), we get a palindrome (42483438424).

The spelling of 21361222112 in words is "twenty-one billion, three hundred sixty-one million, two hundred twenty-two thousand, one hundred twelve".