21325042606 has 32 divisors (see below), whose sum is σ = 37124017920. Its totient is φ = 8997759936.

The previous prime is 21325042577. The next prime is 21325042621. The reversal of 21325042606 is 60624052312.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1954041 + ... + 1964923.

It is an arithmetic number, because the mean of its divisors is an integer number (1160125560).

Almost surely, 2^21325042606 is an apocalyptic number.

21325042606 is a deficient number, since it is larger than the sum of its proper divisors (15798975314).

21325042606 is a wasteful number, since it uses less digits than its factorization.

21325042606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13048.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21325042606 its reverse (60624052312), we get a palindrome (81949094918).

The spelling of 21325042606 in words is "twenty-one billion, three hundred twenty-five million, forty-two thousand, six hundred six".