21212433111 has 64 divisors (see below), whose sum is σ = 31630808448. Its totient is φ = 12586549248.

The previous prime is 21212433101. The next prime is 21212433113. The reversal of 21212433111 is 11133421212.

It is not a de Polignac number, because 21212433111 - 2¹¹ = 21212431063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212433113) 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 63 ways as a sum of consecutive naturals, for example, 11300305 + ... + 11302181.

It is an arithmetic number, because the mean of its divisors is an integer number (494231382).

Almost surely, 2^21212433111 is an apocalyptic number.

21212433111 is a deficient number, since it is larger than the sum of its proper divisors (10418375337).

21212433111 is a wasteful number, since it uses less digits than its factorization.

21212433111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100.

The product of its digits is 288, while the sum is 21.

Adding to 21212433111 its reverse (11133421212), we get a palindrome (32345854323).

The spelling of 21212433111 in words is "twenty-one billion, two hundred twelve million, four hundred thirty-three thousand, one hundred eleven".