21303202011 has 32 divisors (see below), whose sum is σ = 35060003328. Its totient is φ = 11204421120.

The previous prime is 21303202009. The next prime is 21303202087. The reversal of 21303202011 is 11020230312.

It is not a de Polignac number, because 21303202011 - 2¹ = 21303202009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303202001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17710 + ... + 207171.

It is an arithmetic number, because the mean of its divisors is an integer number (1095625104).

Almost surely, 2^21303202011 is an apocalyptic number.

21303202011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21303202011 is a deficient number, since it is larger than the sum of its proper divisors (13756801317).

21303202011 is a wasteful number, since it uses less digits than its factorization.

21303202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225251.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21303202011 its reverse (11020230312), we get a palindrome (32323432323).

The spelling of 21303202011 in words is "twenty-one billion, three hundred three million, two hundred two thousand, eleven".