21361625206 has 8 divisors (see below), whose sum is σ = 32043231360. Its totient is φ = 10680548088.

The previous prime is 21361625189. The next prime is 21361625317. The reversal of 21361625206 is 60252616312.

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

It is a super-2 number, since 2×21361625206² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7941 + ... + 206848.

It is an arithmetic number, because the mean of its divisors is an integer number (4005403920).

Almost surely, 2^21361625206 is an apocalyptic number.

21361625206 is a deficient number, since it is larger than the sum of its proper divisors (10681606154).

21361625206 is a wasteful number, since it uses less digits than its factorization.

21361625206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264518.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21361625206 in words is "twenty-one billion, three hundred sixty-one million, six hundred twenty-five thousand, two hundred six".