21662070306 has 32 divisors (see below), whose sum is σ = 44105947200. Its totient is φ = 7090653120.

The previous prime is 21662070301. The next prime is 21662070323. The reversal of 21662070306 is 60307026612.

It is not an unprimeable number, because it can be changed into a prime (21662070301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300600 + ... + 365628.

It is an arithmetic number, because the mean of its divisors is an integer number (1378310850).

Almost surely, 2^21662070306 is an apocalyptic number.

21662070306 is an abundant number, since it is smaller than the sum of its proper divisors (22443876894).

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

21662070306 is a wasteful number, since it uses less digits than its factorization.

21662070306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66034.

The product of its (nonzero) digits is 18144, while the sum is 33.

Adding to 21662070306 its reverse (60307026612), we get a palindrome (81969096918).

The spelling of 21662070306 in words is "twenty-one billion, six hundred sixty-two million, seventy thousand, three hundred six".