21212202111 has 8 divisors (see below), whose sum is σ = 29512629120. Its totient is φ = 13526621592.

The previous prime is 21212202101. The next prime is 21212202127. The reversal of 21212202111 is 11120221212.

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

It is not a de Polignac number, because 21212202111 - 2¹⁵ = 21212169343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212202101) 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 7 ways as a sum of consecutive naturals, for example, 153711541 + ... + 153711678.

It is an arithmetic number, because the mean of its divisors is an integer number (3689078640).

Almost surely, 2^21212202111 is an apocalyptic number.

21212202111 is a deficient number, since it is larger than the sum of its proper divisors (8300427009).

21212202111 is a wasteful number, since it uses less digits than its factorization.

21212202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307423245.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212202111 its reverse (11120221212), we get a palindrome (32332423323).

The spelling of 21212202111 in words is "twenty-one billion, two hundred twelve million, two hundred two thousand, one hundred eleven".