21212111121212 has 96 divisors (see below), whose sum is σ = 43072402544640. Its totient is φ = 9048811968000.

The previous prime is 21212111121167. The next prime is 21212111121269.

It is a happy number.

21212111121212 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13429553 + ... + 14925719.

It is an arithmetic number, because the mean of its divisors is an integer number (448670859840).

Almost surely, 2^{21212111121212} is an apocalyptic number.

21212111121212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212111121212 is an abundant number, since it is smaller than the sum of its proper divisors (21860291423428).

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

21212111121212 is a wasteful number, since it uses less digits than its factorization.

21212111121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496523 (or 1496521 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

It can be divided in two parts, 2121211 and 1121212, that added together give a palindrome (3242423).

The spelling of 21212111121212 in words is "twenty-one trillion, two hundred twelve billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twelve".