21212332111 has 8 divisors (see below), whose sum is σ = 21515186304. Its totient is φ = 20909591640.

The previous prime is 21212332103. The next prime is 21212332121. The reversal of 21212332111 is 11123321212.

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 21212332111 - 2³ = 21212332103 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 (21212332121) 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, 391096 + ... + 442018.

It is an arithmetic number, because the mean of its divisors is an integer number (2689398288).

Almost surely, 2^21212332111 is an apocalyptic number.

21212332111 is a deficient number, since it is larger than the sum of its proper divisors (302854193).

21212332111 is an equidigital number, since it uses as much as digits as its factorization.

21212332111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56861.

The product of its digits is 144, while the sum is 19.

Adding to 21212332111 its reverse (11123321212), we get a palindrome (32335653323).

The spelling of 21212332111 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-two thousand, one hundred eleven".