21102202011 has 16 divisors (see below), whose sum is σ = 30699780480. Its totient is φ = 12786851520.

The previous prime is 21102202007. The next prime is 21102202073. The reversal of 21102202011 is 11020220112.

It is not a de Polignac number, because 21102202011 - 2² = 21102202007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102202091) 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 15 ways as a sum of consecutive naturals, for example, 131536 + ... + 243938.

It is an arithmetic number, because the mean of its divisors is an integer number (1918736280).

Almost surely, 2^21102202011 is an apocalyptic number.

21102202011 is a deficient number, since it is larger than the sum of its proper divisors (9597578469).

21102202011 is a wasteful number, since it uses less digits than its factorization.

21102202011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118106.

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

Adding to 21102202011 its reverse (11020220112), we get a palindrome (32122422123).

The spelling of 21102202011 in words is "twenty-one billion, one hundred two million, two hundred two thousand, eleven".