21020102111211 has 24 divisors (see below), whose sum is σ = 32603559058944. Its totient is φ = 12011136293520.

The previous prime is 21020102111189. The next prime is 21020102111219. The reversal of 21020102111211 is 11211120102012.

It is a happy number.

It is not a de Polignac number, because 21020102111211 - 2⁵ = 21020102111179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020102111219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3008026 + ... + 7147616.

It is an arithmetic number, because the mean of its divisors is an integer number (1358481627456).

Almost surely, 2^{21020102111211} is an apocalyptic number.

21020102111211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21020102111211 is a deficient number, since it is larger than the sum of its proper divisors (11583456947733).

21020102111211 is a wasteful number, since it uses less digits than its factorization.

21020102111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174151 (or 4174144 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21020102111211 its reverse (11211120102012), we get a palindrome (32231222213223).

The spelling of 21020102111211 in words is "twenty-one trillion, twenty billion, one hundred two million, one hundred eleven thousand, two hundred eleven".