21361222111 has 8 divisors (see below), whose sum is σ = 22051979264. Its totient is φ = 20670570360.

The previous prime is 21361222087. The next prime is 21361222117. The reversal of 21361222111 is 11122216312.

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

It is a cyclic number.

It is not a de Polignac number, because 21361222111 - 2⁷ = 21361221983 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736690 + ... + 765136.

It is an arithmetic number, because the mean of its divisors is an integer number (2756497408).

Almost surely, 2^21361222111 is an apocalyptic number.

21361222111 is a deficient number, since it is larger than the sum of its proper divisors (690757153).

21361222111 is a wasteful number, since it uses less digits than its factorization.

21361222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52701.

The product of its digits is 288, while the sum is 22.

Adding to 21361222111 its reverse (11122216312), we get a palindrome (32483438423).

The spelling of 21361222111 in words is "twenty-one billion, three hundred sixty-one million, two hundred twenty-two thousand, one hundred eleven".