21212111118 has 16 divisors (see below), whose sum is σ = 46280969856. Its totient is φ = 6427912440.

The previous prime is 21212111101. The next prime is 21212111143. The reversal of 21212111118 is 81111121212.

It is a junction number, because it is equal to n+sod(n) for n = 21212111094 and 21212111103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160697746 + ... + 160697877.

It is an arithmetic number, because the mean of its divisors is an integer number (2892560616).

Almost surely, 2^21212111118 is an apocalyptic number.

21212111118 is an abundant number, since it is smaller than the sum of its proper divisors (25068858738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212111118 is a wasteful number, since it uses less digits than its factorization.

21212111118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321395639.

The product of its digits is 64, while the sum is 21.

The spelling of 21212111118 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred eighteen".