21163011306 has 16 divisors (see below), whose sum is σ = 44815788864. Its totient is φ = 6639376064.

The previous prime is 21163011299. The next prime is 21163011307. The reversal of 21163011306 is 60311036112.

It is not an unprimeable number, because it can be changed into a prime (21163011307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103740150 + ... + 103740353.

It is an arithmetic number, because the mean of its divisors is an integer number (2800986804).

Almost surely, 2^21163011306 is an apocalyptic number.

21163011306 is an abundant number, since it is smaller than the sum of its proper divisors (23652777558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21163011306 is a wasteful number, since it uses less digits than its factorization.

21163011306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207480525.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21163011306 its reverse (60311036112), we get a palindrome (81474047418).

The spelling of 21163011306 in words is "twenty-one billion, one hundred sixty-three million, eleven thousand, three hundred six".