21020102211 has 32 divisors (see below), whose sum is σ = 29786803200. Its totient is φ = 13148110080.

The previous prime is 21020102143. The next prime is 21020102273. The reversal of 21020102211 is 11220102012.

It is not a de Polignac number, because 21020102211 - 2¹¹ = 21020100163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020102291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3597030 + ... + 3602868.

It is an arithmetic number, because the mean of its divisors is an integer number (930837600).

Almost surely, 2^21020102211 is an apocalyptic number.

21020102211 is a deficient number, since it is larger than the sum of its proper divisors (8766700989).

21020102211 is a wasteful number, since it uses less digits than its factorization.

21020102211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020102211 its reverse (11220102012), we get a palindrome (32240204223).

The spelling of 21020102211 in words is "twenty-one billion, twenty million, one hundred two thousand, two hundred eleven".