21323145306 has 16 divisors (see below), whose sum is σ = 42649436448. Its totient is φ = 7107190800.

The previous prime is 21323145301. The next prime is 21323145323. The reversal of 21323145306 is 60354132312.

It is not an unprimeable number, because it can be changed into a prime (21323145301) 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 7 ways as a sum of consecutive naturals, for example, 37860 + ... + 209951.

It is an arithmetic number, because the mean of its divisors is an integer number (2665589778).

Almost surely, 2^21323145306 is an apocalyptic number.

21323145306 is an abundant number, since it is smaller than the sum of its proper divisors (21326291142).

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

21323145306 is a wasteful number, since it uses less digits than its factorization.

21323145306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262157.

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 21323145306 its reverse (60354132312), we get a palindrome (81677277618).

The spelling of 21323145306 in words is "twenty-one billion, three hundred twenty-three million, one hundred forty-five thousand, three hundred six".