21020302011 has 4 divisors (see below), whose sum is σ = 28027069352. Its totient is φ = 14013534672.

The previous prime is 21020301997. The next prime is 21020302049. The reversal of 21020302011 is 11020302012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21020302011 - 2³³ = 12430367419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020302411) 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 3 ways as a sum of consecutive naturals, for example, 3503383666 + ... + 3503383671.

It is an arithmetic number, because the mean of its divisors is an integer number (7006767338).

Almost surely, 2^21020302011 is an apocalyptic number.

21020302011 is a deficient number, since it is larger than the sum of its proper divisors (7006767341).

21020302011 is an equidigital number, since it uses as much as digits as its factorization.

21020302011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006767340.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21020302011 its reverse (11020302012), we get a palindrome (32040604023).

Subtracting from 21020302011 its reverse (11020302012), we obtain a palindrome (9999999999).

The spelling of 21020302011 in words is "twenty-one billion, twenty million, three hundred two thousand, eleven".