21625266305 has 8 divisors (see below), whose sum is σ = 25951256232. Its totient is φ = 17299588608.

The previous prime is 21625266301. The next prime is 21625266337. The reversal of 21625266305 is 50366252612.

It can be written as a sum of positive squares in 4 ways, for example, as 2446096 + 21622820209 = 1564^2 + 147047^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21625266305 - 2² = 21625266301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21625266301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120017 + ... + 240113.

It is an arithmetic number, because the mean of its divisors is an integer number (3243907029).

Almost surely, 2^21625266305 is an apocalyptic number.

It is an amenable number.

21625266305 is a deficient number, since it is larger than the sum of its proper divisors (4325989927).

21625266305 is a wasteful number, since it uses less digits than its factorization.

21625266305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156115.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 21625266305 in words is "twenty-one billion, six hundred twenty-five million, two hundred sixty-six thousand, three hundred five".