21301264606 has 4 divisors (see below), whose sum is σ = 31951896912. Its totient is φ = 10650632302.

The previous prime is 21301264603. The next prime is 21301264697. The reversal of 21301264606 is 60646210312.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301264601) 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 as a sum of consecutive naturals, namely, 5325316150 + ... + 5325316153.

It is an arithmetic number, because the mean of its divisors is an integer number (7987974228).

Almost surely, 2^21301264606 is an apocalyptic number.

21301264606 is a deficient number, since it is larger than the sum of its proper divisors (10650632306).

21301264606 is a wasteful number, since it uses less digits than its factorization.

21301264606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10650632305.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21301264606 its reverse (60646210312), we get a palindrome (81947474918).

The spelling of 21301264606 in words is "twenty-one billion, three hundred one million, two hundred sixty-four thousand, six hundred six".