21212002121211 has 32 divisors (see below), whose sum is σ = 34695060099840. Its totient is φ = 12700870185600.

The previous prime is 21212002121197. The next prime is 21212002121221. The reversal of 21212002121211 is 11212120021212.

21212002121211 is a `hidden beast` number, since 21 + 21 + 200 + 212 + 1 + 211 = 666.

It is not a de Polignac number, because 21212002121211 - 2¹⁸ = 21212001859067 is a prime.

It is a super-2 number, since 2×21212002121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212002121221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430221630 + ... + 430270931.

It is an arithmetic number, because the mean of its divisors is an integer number (1084220628120).

Almost surely, 2^{21212002121211} is an apocalyptic number.

21212002121211 is a deficient number, since it is larger than the sum of its proper divisors (13483057978629).

21212002121211 is a wasteful number, since it uses less digits than its factorization.

21212002121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860492664 (or 860492658 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21212002121211 its reverse (11212120021212), we get a palindrome (32424122142423).

It can be divided in two parts, 212120021212 and 11, that multiplied together give a palindrome (2333320233332).

The spelling of 21212002121211 in words is "twenty-one trillion, two hundred twelve billion, two million, one hundred twenty-one thousand, two hundred eleven".