21012202121211 has 192 divisors, whose sum is σ = 38702692933632. Its totient is φ = 11118553661952.

The previous prime is 21012202121203. The next prime is 21012202121353. The reversal of 21012202121211 is 11212120221012.

21012202121211 is a `hidden beast` number, since 21 + 0 + 1 + 220 + 212 + 1 + 211 = 666.

It is not a de Polignac number, because 21012202121211 - 2³ = 21012202121203 is a prime.

It is a super-2 number, since 2×21012202121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012202121201) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1718502280 + ... + 1718514506.

It is an arithmetic number, because the mean of its divisors is an integer number (201576525696).

Almost surely, 2^{21012202121211} is an apocalyptic number.

21012202121211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21012202121211 is a deficient number, since it is larger than the sum of its proper divisors (17690490812421).

21012202121211 is a wasteful number, since it uses less digits than its factorization.

21012202121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220 (or 13208 counting only the distinct ones).

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

Adding to 21012202121211 its reverse (11212120221012), we get a palindrome (32224322342223).

The spelling of 21012202121211 in words is "twenty-one trillion, twelve billion, two hundred two million, one hundred twenty-one thousand, two hundred eleven".