21209302911 has 16 divisors (see below), whose sum is σ = 29751751008. Its totient is φ = 13421836800.

The previous prime is 21209302871. The next prime is 21209302921. The reversal of 21209302911 is 11920390212.

It is not a de Polignac number, because 21209302911 - 2¹³ = 21209294719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21209302921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2325630 + ... + 2334731.

It is an arithmetic number, because the mean of its divisors is an integer number (1859484438).

Almost surely, 2^21209302911 is an apocalyptic number.

21209302911 is a deficient number, since it is larger than the sum of its proper divisors (8542448097).

21209302911 is a wasteful number, since it uses less digits than its factorization.

21209302911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660442.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 21209302911 in words is "twenty-one billion, two hundred nine million, three hundred two thousand, nine hundred eleven".