21212000120213 has 12 divisors (see below), whose sum is σ = 24675388198380. Its totient is φ = 18181563789312.

The previous prime is 21212000120177. The next prime is 21212000120243. The reversal of 21212000120213 is 31202100021212.

It can be written as a sum of positive squares in 2 ways, for example, as 19926028244164 + 1285971876049 = 4463858^2 + 1134007^2 .

It is not a de Polignac number, because 21212000120213 - 2²² = 21211995925909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212000120191 and 21212000120200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212000120243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4399253 + ... + 7859861.

It is an arithmetic number, because the mean of its divisors is an integer number (2056282349865).

Almost surely, 2^{21212000120213} is an apocalyptic number.

It is an amenable number.

21212000120213 is a deficient number, since it is larger than the sum of its proper divisors (3463388078167).

21212000120213 is a wasteful number, since it uses less digits than its factorization.

21212000120213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585716 (or 3585709 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21212000120213 its reverse (31202100021212), we get a palindrome (52414100141425).

Subtracting 21212000120213 from its reverse (31202100021212), we obtain a palindrome (9990099900999).

The spelling of 21212000120213 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty thousand, two hundred thirteen".