21212002101211 has 4 divisors (see below), whose sum is σ = 22459766930712. Its totient is φ = 19964237271712.

The previous prime is 21212002101209. The next prime is 21212002101223. The reversal of 21212002101211 is 11210120021212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21212002101211 - 2¹ = 21212002101209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212002101271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623882414725 + ... + 623882414758.

It is an arithmetic number, because the mean of its divisors is an integer number (5614941732678).

Almost surely, 2^{21212002101211} is an apocalyptic number.

21212002101211 is a deficient number, since it is larger than the sum of its proper divisors (1247764829501).

21212002101211 is a wasteful number, since it uses less digits than its factorization.

21212002101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247764829500.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21212002101211 its reverse (11210120021212), we get a palindrome (32422122122423).

The spelling of 21212002101211 in words is "twenty-one trillion, two hundred twelve billion, two million, one hundred one thousand, two hundred eleven".