21212310111 has 8 divisors (see below), whose sum is σ = 28286570880. Its totient is φ = 14139794712.

The previous prime is 21212310103. The next prime is 21212310121. The reversal of 21212310111 is 11101321212.

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

It is not a de Polignac number, because 21212310111 - 2³ = 21212310103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212310121) 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, 407715 + ... + 456788.

It is an arithmetic number, because the mean of its divisors is an integer number (3535821360).

Almost surely, 2^21212310111 is an apocalyptic number.

21212310111 is a deficient number, since it is larger than the sum of its proper divisors (7074260769).

21212310111 is an equidigital number, since it uses as much as digits as its factorization.

21212310111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872685.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21212310111 its reverse (11101321212), we get a palindrome (32313631323).

The spelling of 21212310111 in words is "twenty-one billion, two hundred twelve million, three hundred ten thousand, one hundred eleven".