21620626205 has 32 divisors (see below), whose sum is σ = 28378521600. Its totient is φ = 15752232000.

The previous prime is 21620626201. The next prime is 21620626207. The reversal of 21620626205 is 50262602612.

It is not a de Polignac number, because 21620626205 - 2² = 21620626201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620626201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420386 + ... + 469004.

It is an arithmetic number, because the mean of its divisors is an integer number (886828800).

Almost surely, 2^21620626205 is an apocalyptic number.

It is an amenable number.

21620626205 is a deficient number, since it is larger than the sum of its proper divisors (6757895395).

21620626205 is a wasteful number, since it uses less digits than its factorization.

21620626205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48825.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21620626205 in words is "twenty-one billion, six hundred twenty million, six hundred twenty-six thousand, two hundred five".