21253430534606 has 8 divisors (see below), whose sum is σ = 32064424101864. Its totient is φ = 10565289167320.

The previous prime is 21253430534587. The next prime is 21253430534617. The reversal of 21253430534606 is 60643503435212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30713049560 + ... + 30713050251.

It is an arithmetic number, because the mean of its divisors is an integer number (4008053012733).

Almost surely, 2^{21253430534606} is an apocalyptic number.

21253430534606 is a deficient number, since it is larger than the sum of its proper divisors (10810993567258).

21253430534606 is a wasteful number, since it uses less digits than its factorization.

21253430534606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61426099986.

The product of its (nonzero) digits is 1555200, while the sum is 44.

Adding to 21253430534606 its reverse (60643503435212), we get a palindrome (81896933969818).

The spelling of 21253430534606 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred thirty million, five hundred thirty-four thousand, six hundred six".